Introduction to Trigonometry

What “Introduction to Trigonometry” begins with

INTRODUCTION TO TRIGONOMETRY 113 8 There is perhaps nothing which so occupies the middle position of mathematics as trigonometry. Herbart (1890) 8.1 Introduction You have already studied about triangles, and in particular, right triangles, in your earlier classes. Let us take some examples from our surroundings where right triangles can be imagined to be formed.