The area of an equilateral triangle Student activity Play

The area of the parallelogram Whiteboard exercise Play

The area of the quadrilateral Whiteboard exercise Play

The area of the regular pentagon Whiteboard exercise Play

The area of the triangle Whiteboard exercise Play

The base angles and the vertex angle Whiteboard exercise Play

The bonds in the methanal molecule Animation Play

The camera Whiteboard exercise Play

The camera Student activity Play

The central angle of a regular polygon Whiteboard exercise Play

The central angle of a regular polygon Student activity Play

The cosine of an arbitrary angle Student activity Play

The cosine of an arbitrary angle Simulation Play

The cosine rule Student activity Play

The cosine rule Whiteboard presentation Play

The cosine rule Whiteboard exercise Play

The cosine rule Class 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

The derivation of Snell's Law Animation Play