Triangles symmetrical with respect to a point Whiteboard exercise Play

Triangles – part I Student activity Play

Triangles – part II Student activity Play

Triangles – part III Student activity Play

Triangles – part IV Student activity Play

Triangles – reminder Animation Play

Trigonometric ratios in a right-angled triangle Student activity Play

Trigonometric ratios in a right-angled triangle Whiteboard exercise Play

Trigonometric ratios in a right-angled triangle Whiteboard presentation Play

Trigonometric ratios in a right-angled triangle Class activity Play

Trigonometric ratios – a lighthouse Whiteboard exercise Play

Trigonometric ratios – problems Student activity Play

Trigonometric ratios – the angles of the triangle Whiteboard exercise Play

Trigonometry of a general angle Class activity Play

Trigonometry of a general angle Whiteboard presentation Play

Two right-angled triangles Whiteboard exercise Play

Types of angles Animation Play

Types of triangles Animation Play

Types of triangles – activity Whiteboard exercise Play

Unknown angle in a triangle Animation Play

Unknown side of a triangle Animation Play

Use of a calculator Class activity Play

Use of a calculator Whiteboard presentation Play

Using Heron's formula Animation Play

Using the law of sines Whiteboard exercise Play