Trigonometric Ratios

Summary

trigonometry is concerned with the measurement and calculation of the lengths of sides and the sizes of angles of triangles.

there are three basic ratios called the sine, the cosine and thetangent of the angle. these are abbreviated to sin, cos and tan.

greek letters are often used to stand for angles in triangles.

Key Skills

apply the trigonometric ratios to find the lengths of sides and the size of angles in right-angled triangles.

Vocabulary

 

trigonometry,
trigonometric ratios,
sine,
cosine,
tangent
right angle,
opposite
hypotenuse
adjacent