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.

When labelling a length as the hypotenuse, it can be shortened to 𝒉. (\ (h\)), the opposite close oppositeThe side of a right-angled triangle that is opposite the angle mentioned.