The capacity of a cell Animation Play

The central angle of a regular polygon Student activity Play

The central angle of a regular polygon Whiteboard exercise Play

The concept of a set Student activity Play

The cosine of an arbitrary angle Simulation Play

The cosine of an arbitrary angle Student activity Play

The cosine rule Whiteboard exercise Play

The cosine rule Class activity Play

The cosine rule Student activity Play

The cosine rule Whiteboard presentation Play

The cosine rule – special case Animation Play

The cosine – reducing angles Whiteboard exercise Play

The cosine – reducing angles Student activity 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 C–X bond Animation Play

The C–X bond (1) Student activity Play

The debt is increasing. The debt is decreasing Student activity Play

The derivation of Snell's Law Animation Play

The difference of sets Student activity Play

The difference of sets Whiteboard exercise Play

The distance between the plates Student activity Play

The distance between the plates Simulation Play