Learn about three trigonometric ratios in similar right-angled triangles with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

A 3,700-year old Babylonian clay tablet reveals an ancient method of constructing right-angled triangles that makes it the world’s oldest and most accurate trigonometric table.

Trigonometry is a branch of mathematics that studies relationships between the sides and angles of triangles. Trigonometry is found all throughout geometry, as every straight-sided shape may be ...

Trigonometric ratios of the angle- The ratios of the sides of a right triangle with respect to its acute angles are called trigonometric ratios of the angle. Consider a right triangle ABC, ...

I'm talking about trigonometry, of course: that bastion of angles and triangles that is essential to calculating velocity, momentum, and much more.

2.In a right triangle ABC, right-angled at B, sin A = side opposite to angle A/hypotenuse; ... 4.The values of trigonometric ratios for angles 0°, 30°, 45°, 60° and 90°.