The sides of isosceles triangles Student activity Play

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

The Side–Angle–Side (SAS) property – observations and generalisation Student activity Play

The Side–Side–Side (SSS) property Student activity Play

The Sierpinski Gasket Simulation Play

The sine formula for the area of a triangle Class activity Play

The sine formula for the area of a triangle Whiteboard presentation Play

The sine rule Whiteboard presentation Play

The sine rule Class activity Play

The sine rule (the law of sines) Student activity Play

The sine rule and construction of a triangle Animation Play

The space diagonal of a cube Animation Play

The speed equation triangle Student activity Play

The speed equation triangle Illustration Play

The speed equation triangle Animation Play

The SSS property Animation Play

The sum of a convergent geometric series – applications in geometry Student activity Play

The sum of a convergent geometric series – triangles Whiteboard exercise Play

The sum of the angles in a triangle Animation Play

The sum of the angles in the triangle Animation Play

The sum of the angles in the triangle Whiteboard exercise Play

The sum of the interior angles of a quadrilateral – proof Animation Play

The symmetry of triangles Whiteboard exercise Play

The tangent Whiteboard exercise Play

The tangent Student activity Play