The arrow and the word hypotenuse are coloured orange. The triangle is coloured pink., When using trigonometry in right-angled triangles, each side is labelled based on a given angle, Ɵ.

Trigonometry explores the relationship between sides and angles in right-angled triangles. The sides of a right-angled triangle are labelled with: Hypotenuse (h) – the longest side, which is ...