Subjects

Careers

Open the App

Subjects

3,515

20 Sept 2023

7 pages

Fun with Circle Theorems and Angles: Easy Worksheets and PDFs

A

agvb.

@past3ls

Circle Theorems and Angle Calculations: A Comprehensive Guide

This guide... Show more

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Angles in the Same Segment

This section focuses on another important circle theorem: angles in the same segment are equal. This principle is essential for solving various geometry problems involving circles.

Highlight: Angles in the same segment of a circle are always equal, regardless of where the point is placed on the arc.

The page presents two examples to illustrate this concept:

  1. A problem where students must calculate two angles within the same segment, demonstrating their equality.
  2. An application of the theorem to find an angle based on a given equal angle in the same segment.

Vocabulary: Segment - A portion of a circle's area bounded by a chord and an arc.

Understanding this theorem is crucial for tackling more complex circle theorems questions and problems involving cyclic quadrilaterals.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Cyclic Quadrilaterals

This page delves into the properties of cyclic quadrilaterals, which are four-sided shapes inscribed within a circle. It introduces a key theorem about opposite angles in cyclic quadrilaterals.

Definition: A cyclic quadrilateral is a four-sided shape where all four vertices touch the circumference of a circle.

The main property highlighted is that opposite angles in a cyclic quadrilateral are supplementary, meaning they add up to 180°. This principle is fundamental in solving many cyclic quadrilateral problems.

Highlight: In a cyclic quadrilateral, opposite angles are supplementary theysumto180°they sum to 180°.

The page provides two detailed examples demonstrating how to apply this property to calculate unknown angles in cyclic quadrilaterals. These examples are excellent practice for students preparing for GCSE-level circle theorems and angles calculations.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Angles in a Semicircle

This section focuses on a specific case of angles in a circle: the angle in a semicircle. It introduces the important theorem that an angle inscribed in a semicircle is always a right angle 90°90°.

Definition: A semicircle is half of a circle, formed by a diameter and the arc it subtends.

The page provides a clear example demonstrating how to use this theorem in conjunction with other angle properties to solve more complex problems. This example involves calculating an unknown angle using the semicircle theorem and properties of triangles.

Highlight: The angle inscribed in a semicircle is always 90° arightanglea right angle.

This theorem is particularly useful in identifying right angles in geometric figures and is often featured in circle theorems questions and answers.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Tangents to Circles

This page introduces two important properties of tangents to circles:

  1. The angle between a tangent and a radius drawn to the point of contact is 90° perpendicularperpendicular.
  2. Tangents drawn from an external point to a circle are equal in length.

Vocabulary: Tangent - A line that touches a circle at exactly one point.

The page provides an example problem that combines both of these properties, requiring students to calculate angles involving tangents and radii. This type of question is common in circle theorems and angles calculations GCSE exams.

Example: In a problem where two tangents are drawn from an external point, the angles between the tangents and the line joining the center to the external point are equal.

Understanding these tangent properties is crucial for solving more advanced circle theorem questions and problems involving complex geometric constructions.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Perpendicular from Center to Chord

This page focuses on the relationship between a perpendicular line from the center of a circle to a chord. It introduces the theorem that this perpendicular line bisects cutsinhalfcuts in half the chord.

Definition: A chord is a line segment whose endpoints both lie on a circle.

The page provides a detailed example problem that applies this theorem along with the Pythagorean theorem to calculate the distance from the center of a circle to the midpoint of a chord.

Highlight: The perpendicular from the center of a circle to a chord always bisects the chord.

This theorem is particularly useful in problems involving chord lengths and their relationship to the circle's radius, which are common in circle theorems and angles calculations worksheets.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Alternate Segment Theorem

The final page introduces the alternate segment theorem, which relates the angle between a tangent and a chord at the point of contact to the angle in the alternate segment.

Definition: The alternate segment is the segment on the opposite side of a chord from a given point on the circle.

The theorem states that the angle between a tangent and a chord at the point of contact is equal to the angle in the alternate segment.

Highlight: The angle between a tangent and a chord equals the angle in the alternate segment.

The page provides a complex example that combines this theorem with other circle properties to calculate multiple angles. This type of question often appears in advanced circle theorems questions and answers PDF resources.

Understanding this theorem is crucial for solving more challenging geometry problems and is often tested in higher-level mathematics exams.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Circle Theorems: Angles at Center and Circumference

This page introduces the fundamental relationship between angles at the center and circumference of a circle. It explains how angles at the center are twice the size of corresponding angles at the circumference when subtended by the same arc.

Definition: The angle at the center of a circle is twice the angle at the circumference when both angles are subtended by the same arc.

The page provides two detailed examples demonstrating how to apply this theorem to calculate missing angles. In both cases, students are shown how to use the 2:1 ratio between center and circumference angles to solve problems.

Example: Given an angle of 40° at the circumference, the corresponding angle at the center would be 80° 40°×240° × 2.

This theorem forms the foundation for many circle theorems and angles calculations, making it crucial for students to master early in their geometry studies.



Can't find what you're looking for? Explore other subjects.

Students love us — and so will you.

4.9/5

App Store

4.8/5

Google Play

The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.

Stefan S

iOS user

This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.

Samantha Klich

Android user

Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.

Anna

iOS user

Best app on earth! no words because it’s too good

Thomas R

iOS user

Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.

Basil

Android user

This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.

David K

iOS user

The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!

Sudenaz Ocak

Android user

In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.

Greenlight Bonnie

Android user

very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.

Rohan U

Android user

I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.

Xander S

iOS user

THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮

Elisha

iOS user

This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now

Paul T

iOS user

The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.

Stefan S

iOS user

This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.

Samantha Klich

Android user

Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.

Anna

iOS user

Best app on earth! no words because it’s too good

Thomas R

iOS user

Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.

Basil

Android user

This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.

David K

iOS user

The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!

Sudenaz Ocak

Android user

In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.

Greenlight Bonnie

Android user

very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.

Rohan U

Android user

I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.

Xander S

iOS user

THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮

Elisha

iOS user

This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now

Paul T

iOS user

 

Maths

3,515

20 Sept 2023

7 pages

Fun with Circle Theorems and Angles: Easy Worksheets and PDFs

A

agvb.

@past3ls

Circle Theorems and Angle Calculations: A Comprehensive Guide

This guide covers essential circle theorems and angles calculationsfor geometry students. It explores key concepts like angles at the center and circumference, cyclic quadrilaterals, and tangent properties, providing clear explanations and... Show more

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Angles in the Same Segment

This section focuses on another important circle theorem: angles in the same segment are equal. This principle is essential for solving various geometry problems involving circles.

Highlight: Angles in the same segment of a circle are always equal, regardless of where the point is placed on the arc.

The page presents two examples to illustrate this concept:

  1. A problem where students must calculate two angles within the same segment, demonstrating their equality.
  2. An application of the theorem to find an angle based on a given equal angle in the same segment.

Vocabulary: Segment - A portion of a circle's area bounded by a chord and an arc.

Understanding this theorem is crucial for tackling more complex circle theorems questions and problems involving cyclic quadrilaterals.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Cyclic Quadrilaterals

This page delves into the properties of cyclic quadrilaterals, which are four-sided shapes inscribed within a circle. It introduces a key theorem about opposite angles in cyclic quadrilaterals.

Definition: A cyclic quadrilateral is a four-sided shape where all four vertices touch the circumference of a circle.

The main property highlighted is that opposite angles in a cyclic quadrilateral are supplementary, meaning they add up to 180°. This principle is fundamental in solving many cyclic quadrilateral problems.

Highlight: In a cyclic quadrilateral, opposite angles are supplementary theysumto180°they sum to 180°.

The page provides two detailed examples demonstrating how to apply this property to calculate unknown angles in cyclic quadrilaterals. These examples are excellent practice for students preparing for GCSE-level circle theorems and angles calculations.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Angles in a Semicircle

This section focuses on a specific case of angles in a circle: the angle in a semicircle. It introduces the important theorem that an angle inscribed in a semicircle is always a right angle 90°90°.

Definition: A semicircle is half of a circle, formed by a diameter and the arc it subtends.

The page provides a clear example demonstrating how to use this theorem in conjunction with other angle properties to solve more complex problems. This example involves calculating an unknown angle using the semicircle theorem and properties of triangles.

Highlight: The angle inscribed in a semicircle is always 90° arightanglea right angle.

This theorem is particularly useful in identifying right angles in geometric figures and is often featured in circle theorems questions and answers.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Tangents to Circles

This page introduces two important properties of tangents to circles:

  1. The angle between a tangent and a radius drawn to the point of contact is 90° perpendicularperpendicular.
  2. Tangents drawn from an external point to a circle are equal in length.

Vocabulary: Tangent - A line that touches a circle at exactly one point.

The page provides an example problem that combines both of these properties, requiring students to calculate angles involving tangents and radii. This type of question is common in circle theorems and angles calculations GCSE exams.

Example: In a problem where two tangents are drawn from an external point, the angles between the tangents and the line joining the center to the external point are equal.

Understanding these tangent properties is crucial for solving more advanced circle theorem questions and problems involving complex geometric constructions.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Perpendicular from Center to Chord

This page focuses on the relationship between a perpendicular line from the center of a circle to a chord. It introduces the theorem that this perpendicular line bisects cutsinhalfcuts in half the chord.

Definition: A chord is a line segment whose endpoints both lie on a circle.

The page provides a detailed example problem that applies this theorem along with the Pythagorean theorem to calculate the distance from the center of a circle to the midpoint of a chord.

Highlight: The perpendicular from the center of a circle to a chord always bisects the chord.

This theorem is particularly useful in problems involving chord lengths and their relationship to the circle's radius, which are common in circle theorems and angles calculations worksheets.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Alternate Segment Theorem

The final page introduces the alternate segment theorem, which relates the angle between a tangent and a chord at the point of contact to the angle in the alternate segment.

Definition: The alternate segment is the segment on the opposite side of a chord from a given point on the circle.

The theorem states that the angle between a tangent and a chord at the point of contact is equal to the angle in the alternate segment.

Highlight: The angle between a tangent and a chord equals the angle in the alternate segment.

The page provides a complex example that combines this theorem with other circle properties to calculate multiple angles. This type of question often appears in advanced circle theorems questions and answers PDF resources.

Understanding this theorem is crucial for solving more challenging geometry problems and is often tested in higher-level mathematics exams.

vircbe theorenos
•Angles at the CENTRE are twice the angle at the
CIRCUMFERENCE
EXAMPLES
X
20
(168"
Calculate the Missing angles x and y
D
y

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Circle Theorems: Angles at Center and Circumference

This page introduces the fundamental relationship between angles at the center and circumference of a circle. It explains how angles at the center are twice the size of corresponding angles at the circumference when subtended by the same arc.

Definition: The angle at the center of a circle is twice the angle at the circumference when both angles are subtended by the same arc.

The page provides two detailed examples demonstrating how to apply this theorem to calculate missing angles. In both cases, students are shown how to use the 2:1 ratio between center and circumference angles to solve problems.

Example: Given an angle of 40° at the circumference, the corresponding angle at the center would be 80° 40°×240° × 2.

This theorem forms the foundation for many circle theorems and angles calculations, making it crucial for students to master early in their geometry studies.

Can't find what you're looking for? Explore other subjects.

Students love us — and so will you.

4.9/5

App Store

4.8/5

Google Play

The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.

Stefan S

iOS user

This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.

Samantha Klich

Android user

Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.

Anna

iOS user

Best app on earth! no words because it’s too good

Thomas R

iOS user

Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.

Basil

Android user

This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.

David K

iOS user

The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!

Sudenaz Ocak

Android user

In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.

Greenlight Bonnie

Android user

very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.

Rohan U

Android user

I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.

Xander S

iOS user

THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮

Elisha

iOS user

This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now

Paul T

iOS user

The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.

Stefan S

iOS user

This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.

Samantha Klich

Android user

Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.

Anna

iOS user

Best app on earth! no words because it’s too good

Thomas R

iOS user

Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.

Basil

Android user

This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.

David K

iOS user

The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!

Sudenaz Ocak

Android user

In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.

Greenlight Bonnie

Android user

very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.

Rohan U

Android user

I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.

Xander S

iOS user

THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮

Elisha

iOS user

This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now

Paul T

iOS user