The centre and the radius of a circle Simulation Play

The centre of a circle Animation Play

The centre of gravity Animation Play

The circle Whiteboard presentation Play

The circle Class activity Play

The circle and its equation Animation Play

The circle and the equilateral triangle Student activity Play

The circle with centre at an arbitrary point Whiteboard exercise Play

The circle with centre at the origin Student activity Play

The circle with centre at the origin Whiteboard exercise Play

The clock Animation Play

The composition of two enlargements Animation Play

The cosine of an arbitrary angle Simulation Play

The cosine of an arbitrary angle Student activity Play

The cosine rule Whiteboard presentation Play

The cosine rule Whiteboard exercise Play

The cosine rule Class activity Play

The cosine rule Student activity Play

The cosine rule – special case Animation Play

The cosine – reducing angles Student activity Play

The cosine – reducing angles Whiteboard exercise Play

The cotangent function Whiteboard exercise Play

The counterexample Whiteboard exercise Play

The critical angle Whiteboard exercise Play

The critical angle Whiteboard exercise Play