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

A triangle symmetrical with respect to a line Student activity Play

AA property of similar triangles Student activity Play

AA property of similar triangles Animation Play

All the possible triangles Whiteboard exercise Play

Angles and sides of triangles Student activity Play

Angles and sides of triangles Whiteboard exercise Play

Angles in special triangles Whiteboard exercise Play

Angles in triangles and quadrilaterals Whiteboard presentation Play

Angles in triangles and quadrilaterals Class activity Play

Angles of special triangles Student activity Play

Are the two triangles similar? Animation Play

Areas of plane shapes (1) Class activity Play

Areas of plane shapes (1) Whiteboard presentation Play

Areas of polygons made of triangles – problems Whiteboard exercise Play

Areas of polygons made of triangles – problems Student activity Play

Building Student activity Play

Building Simulation Play

Building 3-D objects with cubes Whiteboard exercise Play

Building 3-D objects with cubes Student activity Play

Building a demonstration from a proof Student activity Play

Building a demonstration from a proof Whiteboard exercise Play

Building a proof Student activity Play

Building a proof Whiteboard exercise Play

Building a proof from a demonstration Student activity Play