Trigonometric functions of the general angle Student activity Play

Trigonometric identity for tangent and cotangent Simulation Play

Trigonometric ratios in a right-angled triangle Class activity Play

Trigonometric ratios in a right-angled triangle Whiteboard presentation Play

Trigonometric ratios – a lighthouse Whiteboard exercise Play

Trigonometric ratios – distance to a star Whiteboard exercise Play

Trigonometric ratios – problems Student activity Play

Trigonometric ratios – the altitude of the Sun Whiteboard exercise Play

Trigonometric ratios – the angles of the triangle Whiteboard exercise Play

Trigonometry of a general angle Whiteboard presentation Play

Trigonometry of a general angle Class activity Play

Triiodide ion molecule Animation Play

Trisecting an angle Animation Play

Two circles Simulation Play

Two circles Student activity Play

Two circles and a line Whiteboard exercise Play

Two circles and a line Student activity Play

Two circles externally tangent Whiteboard exercise Play

Two circles internally tangent Whiteboard exercise Play

Two isosceles triangles Whiteboard exercise Play

Two mirrors Animation Play

Two mirrors Animation Play

Two points on the shoreline Animation Play

Two right-angled triangles Whiteboard exercise Play

Two vectors and the angle between them Whiteboard exercise Play