Page 2: Triangles, Quadrilaterals, and Polygons

This page explores triangle properties, polygon classifications, and methods for calculating interior angles in various shapes.

Definition: A polygon is a 2D shape with straight edges only, and it's considered regular when all sides and angles are equal.

Highlight: Triangle interior angles always sum to 180°, while quadrilateral interior angles sum to 360°.

Example: Triangle types include:

• Right-angled triangles (one 90° angle)
• Isosceles triangles (two equal sides and angles)
• Equilateral triangles (all sides and angles equal)
• Scalene triangles (all sides and angles different)

Vocabulary: Polygon names are based on their number of sides:

• Pentagon (5 sides)
• Hexagon (6 sides)
• Heptagon/Septagon (7 sides)
• Octagon (8 sides)
• Nonagon (9 sides)
• Decagon (10 sides)

Page 3: Quadrilateral Properties

This page details the properties of various quadrilaterals, including squares, rectangles, rhombuses, parallelograms, kites, and trapeziums.

Definition: Each quadrilateral type has unique properties related to:

• Side lengths
• Angle measurements
• Parallel sides
• Diagonal relationships
• Symmetry
• Rotational properties

Example: A square has:

• Four equal sides
• Four right angles
• Opposite sides parallel
• Diagonals bisecting at right angles
• Four lines of symmetry
• Rotational symmetry of order four

Highlight: The properties of special quadrilaterals build upon each other, with squares having the most properties and trapeziums having the least.

Page 1: Basic Angle Concepts and Parallel Lines

This page introduces fundamental angle concepts and their properties. The content begins with basic angle classifications and notation methods, progressing to more complex angle relationships.

Definition: Angles are classified into four main types based on their measurements: acute (<90°), right (90°), obtuse (>90° but <180°), and reflex (>180° but <360°).

Vocabulary: Angle notation can use either single lowercase letters (e.g., 'a' or 'x') or three uppercase letters (e.g., BAC).

Highlight: Angles around a point sum to 360°, while angles on a straight line sum to 180°.

Example: Parallel line relationships include:

• Vertically opposite angles are equal
• Alternate angles are equal (Z-pattern)
• Corresponding angles are equal (F-pattern)
• Co-interior angles sum to 180° (C-pattern)