💁 TRIGONOMETRY 🙋 INTRODUCTION:- The word trigonometry is derived from three Greek words 'Tri'( means three) 'gon' (means sides) and 'metron ' (means measure) i.e measurement of sides & angles of triangle . DEFINITION:- Trigonometry is a branch of mathematics which deals with measurement of angles and sides of triangle . TRIGONOMETRIC RATIO:- Ratio of the sides of a right triangle with respect to its acute angles is called trigonometry ratio of the angles. STANDARD TRIGONOMETRY RATIO( T - RATIO). 1. Sin A = P 4. Cosec A = H H. ...