# Key Stage 3, Maths, Surds and trigonometry

Lesson 1

## Rational and irrational numbers

Lesson 2

## Introduction to Surds

Lesson 3

## Surds and triangles

Lesson 4

## Manipulating surds

Lesson 5

## Varying the ratio of side lengths in right angle triangles

Lesson 6

## The case of 30 and 60 degrees

Lesson 7

## The sine ratio

Lesson 8

## The sine and cosine ratios

Lesson 9

## The sine and cosine ratios for 30 and 60 degrees

Lesson 10

## Finding missing sides using sine and cosine for any angle

Lesson 11

## Using inverse sine and cosine to find missing angles

Lesson 12