Pythagoras’ Theorem (AQA GCSE Maths): Flashcards

Find unknown side lengths in right-angled triangles

$a^2 + b^2 = c^2$

Longest side opposite the right angle

Right-angled triangles only (with 90° angle)

Lengths of two sides to find the third

As simplified surds, not decimals

Draw sketch, find horizontal/vertical lengths, apply Pythagoras

Hypotenuse should be longer than other two sides

The hypotenuse (longest side)

Maintain precision better than decimal approximations