The counterexample Whiteboard exercise Play

The cube root Animation Play

The defects of lenses Student activity Play

The diagonal of a square Student activity Play

The diagonal of a square Whiteboard exercise Play

The diameter of the Earth Whiteboard exercise Play

The distance between the images Animation Play

The distance formula – applications Student activity Play

The double helix of DNA Student activity Play

The eaves of the cottage roof 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 focal length and the shape of a lens Animation Play

The focal point of a concave mirror Animation Play

The focal point of a concave mirror Student activity Play

The focal point of a concave mirror Whiteboard exercise Play

The focal point of a concave mirror Simulation Play

The formation of an image by a spherical mirror Simulation Play

The formation of an image by a spherical mirror Whiteboard exercise Play

The formation of an image by a spherical mirror Student activity Play

The formula for the area of a triangle Animation Play

The formula for the space diagonal of a cube Whiteboard exercise Play

The formula for the space diagonal of a cube Student activity Play

The frequency of free oscillation Whiteboard exercise Play