Trigonometry

vector arrows

Vectors

A vector quantity has both size and direction.There's a few way vectors are written. For example if a vector goes 3 units right and 4 units up, is called a and ...
3d trig example

3D Trigonometry

Trig can look really scary in 3D....but if you keep calm and simplify it by drawing it as 2D shapes you'll be rewarded with an A*. Example: ABCDEFGH is a cub...
pythagoras theorem

Pythagoras’ Theorem

This only works for right angled triangles!Examiners love to give you "distance between two points" questions that involve this theorem. Example: Find the di...
trigonometry triangles

Sin, Cos, Tan

There's three different sides to a triangle: The hypotenuse is the longest side The opposite is the side opposite to the angle being used in the question ...
sine and cosine notation

The Sine and Cosine Rules

SOH CAH TOA applies to right angled triangles....but when you have other triangles the sine and cosine rules come into play. In the following formulae the trian...
3d pythagoras in a cuboid

3D Pythagoras

With 3D shapes sometimes you need to use Pythagoras more than once to find a particular length.CuboidsThere's a formula in cuboids for finding the length of the...