The content of a problem as an algebraic expression Animation Play

The converse of the Pythagorean theorem Whiteboard exercise Play

The converse of the Pythagorean theorem Student activity Play

The correctness of a construction Student activity Play

The correctness of a construction Animation 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 leading to two solutions Animation Play

The cosine rule – special case Animation Play

The counterexample Whiteboard exercise Play

The diagonal of a square Student activity Play

The distance between the points Animation Play

The distance formula Student activity Play

The distance formula – applications Student activity Play

The division of a triangle Student activity Play

The division of the triangle Whiteboard exercise Play

The enlargement of the triangle Animation Play

The equilateral triangle Student activity Play

The equilateral triangle and the square Whiteboard exercise Play

The exterior and interior angles of a triangle Whiteboard exercise Play

The fascinating polynomials Whiteboard exercise Play

The fascinating polynomials (1 + x) n Student activity Play

The first tangent theorem – perpendicularity Student activity Play