## Trigonometry

## Naming the Sides of a Right-Angled Triangle

In this tutorial I show you how to name the sides of a right-angled triangle in preparation for using trigonometry to find lengths and angles in right-angled triangles.

## Trig Ratios: sinθ, cosθ and tanθ

In this tutorial I show you the trigonometric ratios sinθ, cosθ and tanθ and easy ways to remember them.

## Missing Side on the Top of the Trig Ratio

In this tutorial I show you how to find the length of a side by using trigonometry when the missing side is in the top of the trig ratio fraction.

## Missing Side on the Bottom of the Trig Ratio

In this tutorial I show you how to find the length of a side by using trigonometry when the missing side is in the bottom of the trig ratio fraction.

## Mixed Exercise

In this tutorial I show you how to find an angle by using trigonometry when you are given any two sides of a right-angled triangle.