Trigonometric Functions

by M. Bourne

Why learn about trigonometric functions...?

opera house
Example problem:

How high above sea level is the top of the Sydney Opera House? Have you ever thought about how to measure that height?

The trigonometric functions are very important in technical subjects like science, engineering, architecture, and even medicine. You will come across trig functions all the time and you are encouraged to learn them well!

Surveying is one of the many applications. Road makers, bridge builders and those whose job it is to get buildings in the right place all use trigonometry in their daily work.

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In this chapter we start by explaining the basic trigonometric functions using degrees (°), and in the later part of the chapter we will learn about radians and how they are used in trigonometry.