# Trigonometric Ratios

Trigonometry is a very important branch of mathematics, which basically deals with triangles and their sides and angles. Trigonometry illustrates six trigonometric functions which are sine, cosine, tangent, cosecant, secant and cotangent. These trigonometric functions are defined in context with right-angled triangle and are expressed as the ratio of two sides of right triangle. These ratios are called trigonometric ratios.

Trigonometric ratios are perhaps the most important part of mathematics. Apart from maths, these ratios are used in physics, chemistry and other branches of science. So, it is essential to have sufficient understanding of trigonometric ratios.