The ASA property Animation Play

The congruent trapezium Simulation Play

The congruent triangle Simulation Play

The counterexample Whiteboard exercise Play

The exterior angles of a polygon Student activity Play

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

The exterior angles of polygons Whiteboard exercise Play

The four angles Whiteboard exercise Play

The interior angles of a polygon Student activity Play

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

The interior angles of polygons Whiteboard exercise Play

The missing angles in the polygon Whiteboard exercise Play

The missing exterior angles Whiteboard exercise Play

The pairs of congruent figures Simulation Play

The perpendicular bisector in a circle Animation Play

The perpendicular bisector of a line segment Animation Play

The perpendicular bisector of a line segment – a reminder Student activity Play

The polygon made of two triangles Whiteboard exercise Play

The SAS property Animation Play

The shapes that are polygons Whiteboard exercise Play

The Side-Angle-Side (SAS) property Whiteboard exercise Play

The Side-Angle-Side property Whiteboard exercise Play

The Side-Side-Side (SSS) property Whiteboard exercise Play

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

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