Introduction

Trigonometry is a method of calculating the length of the sides of a right angled triangle. The trigonometrical ratios are sine, cosine and tangent. These are shortened to sin, cos and tan

You can find the sine, cosine or tangent of any angle on your calculator. You will need to know the following formulas: 


Sine = Opposite side ÷ Hypotenuse

Cosine = Adjacent side ÷ Hypotenuse

Tangent = Opposite ÷ Adjacent



Use the arrows to click through the pages to view example problems and practice questions, or click the link below to download a printable copy of these activities.

Basic Trigonometry