Construction of a circle circumscribed about a triangle Student activity Play

Construction of a circle inscribed into a triangle Animation Play

Construction of a right-angled triangle Simulation Play

Construction of a triangle Animation Play

Construction of an isosceles right-angled triangle Simulation Play

Construction of an isosceles triangle Whiteboard exercise Play

Construction of bisectors Simulation Play

Construction of regular polygons Student activity Play

Construction of triangles Animation Play

Coronary circulation Animation Play

Corresponding sides Whiteboard exercise Play

Corresponding sides and angles Student activity Play

Creating symmetrical triangles Whiteboard exercise Play

Crossing lines cut by two parallel lines Animation Play

Definition of enlargement Student activity Play

Demonstration of the formula for the area of a triangle Whiteboard exercise Play

Demonstration or proof? Student activity Play

Demonstration or proof? Animation Play

Diminution Animation Play

Dividing an equilateral triangle Animation Play

Dividing an equilateral triangle into nine congruent triangles Whiteboard exercise Play

Dividing an n-sided polygon into triangles Animation Play

Dividing the polygon into triangles Whiteboard exercise Play

Do you remember what a polygon is? Student activity Play

Does the triangle exist? Whiteboard exercise Play