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 derivation of Snell's Law Animation Play

The domain of the trigonometric functions Animation 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

The exterior angle of a regular polygon – proof (2) Animation Play

The first tangent theorem Animation Play

The first tangent theorem – perpendicularity Student activity Play

The first tangent theorem – perpendicularity Whiteboard exercise Play

The floating buoy Animation Play

The force is at some angle to the direction of the movement Animation Play

The forces that need to be exerted on a barrel to pull it up Whiteboard exercise Play

The formula for the area of a triangle Animation Play

The four quadrants Student activity Play