# Pythagoras' theorem explanation 2

The following may also help you remember the Pythagoras' theorem formula.

The sum of the squares `A+B` are exactly the same size as square `C`

The following diagram shows this more explicitly.

`a^2+b^2=c^2`

Proved by

`3times3` | `+` | `4times4` | `=` | `5times5` |

`9` | `+` | `16` | `=` | `25` |

`25` | `=` | `25` |

They call this a three, four, five triangle and it only works with right angled triangles.