The cosine rule Student activity Play

The cosine rule Whiteboard presentation 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 debt is decreasing Whiteboard exercise Play

The debt is increasing Whiteboard exercise Play

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

The decimal as a negative exponent Whiteboard exercise Play

The decimal representation and the negative exponent Whiteboard exercise Play

The derivation of Snell's Law Animation Play

The developing of film Animation Play

The distribution of electrons Animation Play

The domain of the trigonometric functions Animation Play

The effects of mutations in somatic cells – negative for the organism but positive for humans Slideshow Play

The electrochemical series Student activity Play

The enlargement of the triangle Animation Play

The exterior and interior angles of a quadrilateral Whiteboard exercise Play

The exterior and interior angles of a triangle Whiteboard exercise Play

The exterior angle of a regular polygon Student activity Play

The exterior angle of a regular polygon – proof (1) Animation Play