A perpendicular through a point off the line Student activity Play

A perpendicular through a point off the line Simulation Play

A triangle cut into two right-angled triangles Whiteboard exercise Play

Adding a side to a polygon Animation Play

An area problem Student activity Play

An area problem – visualisation Animation Play

Constructing a perpendicular to line at a point off the line Simulation Play

Crossing lines cut by two parallel lines Animation Play

Dimensions of the figure Animation Play

Easy calculations Student activity Play

Fence off a plot Animation Play

Line of reflection symmetry Student activity Play

Paper cut-outs Animation Play

Proportions in crossing lines cut by two parallel lines Whiteboard exercise Play

Proportions in crossing lines cut by two parallel lines Student activity Play

Sides of the trapezium Animation Play

Squaring a binomial difference Student activity Play

The stem-and-leaf diagram for years of experience Student activity Play

The stem-and-leaf diagram – preparing the data Whiteboard exercise Play

The sum of the angles in a polygon Student activity Play

Time needed to cut some amount paper Whiteboard exercise Play

Trapezium Student activity Play

Visualisation of squaring a binomial difference Animation Play