The height of a tree Whiteboard exercise Play

The height of the equilateral triangle Whiteboard exercise Play

The hidden patterns Animation Play

The interior angles of a polygon Student activity Play

The interior angles of an n-sided polygon Whiteboard exercise Play

The isosceles triangle Whiteboard exercise Play

The law of cosines Animation Play

The law of sines Animation Play

The length of the altitude in the triangle Whiteboard exercise Play

The LOGO commands to obtain the given triangle Whiteboard exercise Play

The lunes of Hippocrates Student activity Play

The measure of the angle Whiteboard exercise Play

The measure of the angle in the triangle Whiteboard exercise Play

The method of 'halving the arcs' Whiteboard exercise Play

The missing angle in a triangle Whiteboard exercise Play

The missing angles in special triangles Whiteboard exercise Play

The moon-shaped figures Animation Play

The numbers in Pascal's Triangle Whiteboard exercise Play

The pattern for variables in binomial expansions Student activity Play

The perimeter of the triangle and the diameter of the big circle Animation Play

The perimeters of the triangles – trigonometric ratios for selected angles Whiteboard exercise Play

The perimeters of the triangles – trigonometric ratios for selected angles Whiteboard exercise Play

The perpendicular bisector Student activity Play

The perpendicular bisector Whiteboard exercise Play

The perpendicular bisector in a circle Animation Play