A square and a straight line Student activity Play

A square and a straight line Simulation Play

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

Activities Student activity Play

All the possible triangles Whiteboard exercise Play

An equation Animation 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 Class activity Play

Angles in triangles and quadrilaterals Whiteboard presentation Play

Angles of special triangles Student activity Play

Are the two triangles similar? Animation Play

Areas of plane shapes (1) Whiteboard presentation Play

Areas of plane shapes (1) Class activity Play

Areas of polygons made of triangles – problems Student activity Play

Areas of polygons made of triangles – problems Whiteboard exercise Play

Bigger or smaller Student activity Play

Bigger or smaller Animation Play

Bigger or smaller Whiteboard exercise Play

Building triangles Whiteboard exercise Play

Classification of triangles by angles Animation Play