Answer :
TRIGONOMETRY-
It is a branch of mathematics which deals with the relation of sides and angles of the triangles and with the relevant functions of any angle is known as trigonometry.
It is a branch of mathematics which deals with the relation of sides and angles of the triangles and with the relevant functions of any angle is known as trigonometry.
trigonometry is a is a branch of mathemathics that studies relationships involving lengths and angles of triangle.the father trigonometry is hipparchus.