# What is Trigonometry?

Trigonometry is one of the most important branch of mathematics.

The word trigonometry comes from the Greek words trigonon means “triangle” and metron means “to measure“.

Trigonometry is the study of the relation between the sides and angles of a right-angled triangle.

It helps in the calculation of the unknown dimensions of a right-angled triangle using formulas and identities based on this relationship.

## Definition

Trigonometry is the branch of mathematics that deals with the relationship between ratios of the sides of a right-angled triangle with its angles.

## Who is father of trigonometry?

Hipparchus of Nicaea (190-120 B.C) a Greek astronomer, mathematician and geographer. He is considered to be “the father of trigonometry“.

He created the first to construct a table of values for a trigonometric function and solved several problems of spherical trigonometry by representing the corresponding values of arc and chord for a series of angles such as 0°, 30°, 45°, 60° and 90°, etc.