Exact values of trigonometric ratios for selected angles Student activity Play

Exact values of trigonometric ratios for selected angles Animation Play

Example of derivative of the sum Animation Play

Example of proof Animation Play

Examples of angles Animation Play

Examples of divisibility Animation Play

Examples of refraction Student activity Play

Examples of rotation Student activity Play

Exercises Student activity Play

Exercises Student activity Play

Expanding the squares of the sums Whiteboard exercise Play

Expressions for angles Whiteboard exercise Play

Expressions for angles Student activity Play

Exterior and interior angles of a triangle Student activity Play

Exterior angle of a triangle Whiteboard exercise Play

Exterior angle of a triangle – exercises Student activity Play

Exterior angle of a triangle – observation and proof Student activity Play

Exterior angle of a triangle – proof Animation Play

Exterior angles Animation Play

Exterior angles in a triangle Simulation Play

Exterior angles in a triangle – proof Animation Play

Exterior angles in quadrilaterals Student activity Play

Exterior angles in quadrilaterals Whiteboard exercise Play

Exterior angles in quadrilaterals – a game Game Play

Exterior angles of a triangle Student activity Play