A bird Student activity Play

A perpendicular through a point on the line Student activity Play

A right-angled triangle Student activity Play

A right-angled triangle – adjacent side Whiteboard exercise Play

A right-angled triangle – opposite side Whiteboard exercise Play

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

Angles in a right-angled triangle Whiteboard exercise Play

Applying the Pythagorean theorem Student activity Play

Construction of a right-angled triangle Simulation Play

Construction of an isosceles right-angled triangle Simulation Play

Enlarging the right-angled triangle Simulation Play

Enlarging the right-angled triangle – the basic property Simulation Play

Exact values of trigonometric ratios for selected angles Animation Play

Exact values of trigonometric ratios for selected angles Student activity Play

Finding heights Student activity Play

Finding lengths Student activity Play

Finding sides Student activity Play

Finding the length of a side of a right-angled triangle Whiteboard exercise Play

Finding the measure of an angle of a right-angled triangle Whiteboard exercise Play

Frustum of a cone Student activity Play

Match a triangle Student activity Play

Miscellaneous problems Student activity Play

More constructions Student activity Play

Proofs and assumptions Student activity Play

Pythagorean triples Student activity Play