A square and a straight line Student activity Play

A symmetrical triangle on non-squared paper Student activity Play

A symmetrical triangle on squared paper Whiteboard exercise Play

A symmetrical triangle on squared paper Student activity Play

A tetrahedron Student activity Play

A triangle and circles Simulation Play

A triangle and circles Student activity Play

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

A triangle in a coordinate system Whiteboard exercise Play

A triangle symmetrical with respect to a line Student activity Play

A triangle symmetrical with respect to a line Whiteboard exercise Play

AA property of similar triangles Animation Play

AA property of similar triangles Student activity Play

Addition of forces Class activity Play

Addition of forces by means of a triangle Student activity Play

Addition of forces by means of a triangle Simulation Play

Addition of forces by means of a triangle Whiteboard exercise Play

Aerial Animation Play

Algebraic manipulation of polynomials Class activity Play

Algebraic manipulation of polynomials Whiteboard presentation Play

All the possible triangles Whiteboard exercise Play

Ambiguous case of the sine rule Animation Play

An application of the sine and cosine rules Whiteboard exercise Play

An application of the sine and cosine rules Student activity Play

An exterior angle in a triangle Whiteboard exercise Play