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Updated Mar 22, 2026

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Comprendre le Calcul de l'Aire d'un Parallélogramme et le Volume d'un Prisme en Géométrie

Voici un résumé détaillé des figures planes et des solides... Show more

mathematiques

Figures planes
carre périmètre:cx4
aire: c²

rectangle périmètre : (L+1)x2
triangle périmètre: a+b+c
aire cx h:2




B

b
C
a

Solides en géométrie

Cette page se concentre sur les formules pour calculer le volume et l'aire des solides géométriques, incluant le cube, le pavé droit, le prisme, la pyramide, le cône, le cylindre et la sphère.

Definition: Un solide est un objet géométrique en trois dimensions ayant une longueur, une largeur et une hauteur.

La formule pour le volume d'un prisme en géométrie est particulièrement importante et s'applique à plusieurs formes. Elle consiste à multiplier l'aire de la base par la hauteur du prisme.

Highlight: Le volume d'un cube est calculé en élevant la longueur de son côté au cube (c³), tandis que son aire totale est 6 fois l'aire d'une face (6 x c²).

Pour le pavé droit, le volume est le produit de la longueur, la largeur et la hauteur. Le prisme utilise l'aire de sa base multipliée par sa hauteur pour le volume, et le périmètre de sa base multiplié par sa hauteur pour l'aire latérale.

Example: Un prisme triangulaire avec une base d'aire 10 cm² et une hauteur de 5 cm aurait un volume de 10 x 5 = 50 cm³.

La pyramide et le cône ont des formules de volume similaires, impliquant l'aire de la base multipliée par la hauteur, divisée par 3. Le cylindre utilise l'aire de sa base circulaire multipliée par sa hauteur pour le volume, et 2π x rayon x hauteur pour l'aire latérale.

Enfin, la sphère a des formules uniques pour son volume 4/3xπxr34/3 x π x r³ et son aire (4 x π x r²), où r représente le rayon.

Quote: "La géométrie est l'art de bien raisonner sur des figures mal faites." - Henri Poincaré

Ces formules sont essentielles pour comprendre et calculer les propriétés des solides en géométrie tridimensionnelle.

mathematiques

Figures planes
carre périmètre:cx4
aire: c²

rectangle périmètre : (L+1)x2
triangle périmètre: a+b+c
aire cx h:2




B

b
C
a

Figures planes en mathématiques

Cette page présente les formules essentielles pour calculer le périmètre et l'aire des figures planes courantes en mathématiques. Les figures abordées comprennent le carré, le rectangle, le triangle, le trapèze, le parallélogramme et le cercle.

Highlight: Le calcul de l'aire d'un parallélogramme en mathématiques est une application importante de ces formules.

Pour le carré, le périmètre est calculé en multipliant le côté par 4, tandis que l'aire est obtenue en élevant le côté au carré. Le rectangle utilise la somme des longueurs et largeurs multipliée par 2 pour le périmètre, et le produit de la longueur par la largeur pour l'aire.

Example: Pour un carré de côté 5 cm, le périmètre serait 5 x 4 = 20 cm, et l'aire 5² = 25 cm².

Le triangle a un périmètre égal à la somme de ses trois côtés, et son aire est calculée en multipliant la base par la hauteur, divisé par 2. Le trapèze et le parallélogramme ont des formules spécifiques pour leur périmètre et leur aire, impliquant leurs différents côtés et leur hauteur.

Vocabulary: Le périmètre est la longueur du contour d'une figure plane, tandis que l'aire représente sa surface.

Enfin, pour le cercle, la longueur (circonférence) est calculée avec la formule π x diamètre, et l'aire avec π x rayon².



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Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.

Where can I download the Knowunity app?

You can download the app from Google Play Store and Apple App Store.

Is Knowunity really free of charge?

That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.

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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 Knowunity AI. 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 Knowunity AI. 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

313

Updated Mar 22, 2026

2 pages

Comprendre le Calcul de l'Aire d'un Parallélogramme et le Volume d'un Prisme en Géométrie

Voici un résumé détaillé des figures planes et des solides en mathématiques, mettant l'accent sur les formules de calcul des périmètres, aires et volumes.

• Les figures planes comprennent le carré, le rectangle, le triangle, le trapèze, le parallélogramme et... Show more

mathematiques

Figures planes
carre périmètre:cx4
aire: c²

rectangle périmètre : (L+1)x2
triangle périmètre: a+b+c
aire cx h:2




B

b
C
a

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Solides en géométrie

Cette page se concentre sur les formules pour calculer le volume et l'aire des solides géométriques, incluant le cube, le pavé droit, le prisme, la pyramide, le cône, le cylindre et la sphère.

Definition: Un solide est un objet géométrique en trois dimensions ayant une longueur, une largeur et une hauteur.

La formule pour le volume d'un prisme en géométrie est particulièrement importante et s'applique à plusieurs formes. Elle consiste à multiplier l'aire de la base par la hauteur du prisme.

Highlight: Le volume d'un cube est calculé en élevant la longueur de son côté au cube (c³), tandis que son aire totale est 6 fois l'aire d'une face (6 x c²).

Pour le pavé droit, le volume est le produit de la longueur, la largeur et la hauteur. Le prisme utilise l'aire de sa base multipliée par sa hauteur pour le volume, et le périmètre de sa base multiplié par sa hauteur pour l'aire latérale.

Example: Un prisme triangulaire avec une base d'aire 10 cm² et une hauteur de 5 cm aurait un volume de 10 x 5 = 50 cm³.

La pyramide et le cône ont des formules de volume similaires, impliquant l'aire de la base multipliée par la hauteur, divisée par 3. Le cylindre utilise l'aire de sa base circulaire multipliée par sa hauteur pour le volume, et 2π x rayon x hauteur pour l'aire latérale.

Enfin, la sphère a des formules uniques pour son volume 4/3xπxr34/3 x π x r³ et son aire (4 x π x r²), où r représente le rayon.

Quote: "La géométrie est l'art de bien raisonner sur des figures mal faites." - Henri Poincaré

Ces formules sont essentielles pour comprendre et calculer les propriétés des solides en géométrie tridimensionnelle.

mathematiques

Figures planes
carre périmètre:cx4
aire: c²

rectangle périmètre : (L+1)x2
triangle périmètre: a+b+c
aire cx h:2




B

b
C
a

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Figures planes en mathématiques

Cette page présente les formules essentielles pour calculer le périmètre et l'aire des figures planes courantes en mathématiques. Les figures abordées comprennent le carré, le rectangle, le triangle, le trapèze, le parallélogramme et le cercle.

Highlight: Le calcul de l'aire d'un parallélogramme en mathématiques est une application importante de ces formules.

Pour le carré, le périmètre est calculé en multipliant le côté par 4, tandis que l'aire est obtenue en élevant le côté au carré. Le rectangle utilise la somme des longueurs et largeurs multipliée par 2 pour le périmètre, et le produit de la longueur par la largeur pour l'aire.

Example: Pour un carré de côté 5 cm, le périmètre serait 5 x 4 = 20 cm, et l'aire 5² = 25 cm².

Le triangle a un périmètre égal à la somme de ses trois côtés, et son aire est calculée en multipliant la base par la hauteur, divisé par 2. Le trapèze et le parallélogramme ont des formules spécifiques pour leur périmètre et leur aire, impliquant leurs différents côtés et leur hauteur.

Vocabulary: Le périmètre est la longueur du contour d'une figure plane, tandis que l'aire représente sa surface.

Enfin, pour le cercle, la longueur (circonférence) est calculée avec la formule π x diamètre, et l'aire avec π x rayon².

We thought you’d never ask...

What is the Knowunity AI companion?

Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.

Where can I download the Knowunity app?

You can download the app from Google Play Store and Apple App Store.

Is Knowunity really free of charge?

That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.

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Most popular content in Maths

Most popular content

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

Students love us — and so will you.

4.6/5

App Store

4.7/5

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 Knowunity AI. 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 Knowunity AI. 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