The space diagonals of a cube Student activity Play

The square inscribed in a circle Whiteboard exercise Play

The sum of the angles in a polygon Whiteboard exercise Play

The sum of the angles in a polygon Student activity Play

The symmetry of isosceles triangles Animation Play

The tennis court Whiteboard exercise Play

The trapezium Student activity Play

The two sides and an angle between them Whiteboard exercise Play

The unknown on one side of the equation Whiteboard exercise Play

The unknown on one side of the equation Student activity Play

The unknown on one side of the equation – more difficult problems Student activity Play

Theorems and their assumptions in algebra Whiteboard exercise Play

Theorems and their assumptions in algebra Student activity Play

Theorems and their assumptions in geometry Student activity Play

Tossing a coin Animation Play

Trapezium Whiteboard exercise Play

Trapezium Student activity Play

Trapeziums Student activity Play

Trapeziums Simulation Play

Triangle Animation Play

Triangle Student activity Play

Triangles Student activity Play

Triangles – part I Student activity Play

Triangles – part II Student activity Play

Triangles – part III Student activity Play