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 Animation Play

AA property of similar triangles Student activity Play

All the possible triangles Whiteboard exercise Play

An isosceles trapezoid and a circle Student activity Play

An isosceles trapezoid and a circle 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

Area of the isosceles trapezium Whiteboard exercise 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

Building triangles Whiteboard exercise Play

Checking the triangle in the coordinate system Whiteboard exercise Play

Circles inscribed and circumscribed around a trapezium Student activity Play

Classification of triangles by angles Animation Play

Classification of triangles by sides Animation Play

Congruence of triangles Whiteboard presentation Play