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

Adding a side to a polygon Animation Play

Crossing lines cut by two parallel lines 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

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