General Certificate of Secondary Education (GCSE) Maths Practice Exam 2025 - Free Maths Practice Questions and Study Guide

The hypotenuse in a right triangle is defined as the longest side of the triangle, specifically opposite the right angle. This characteristic is crucial in the context of trigonometric ratios, as the hypotenuse is used in formulas for sine, cosine, and tangent. For instance, in the sine function, the ratio is taken of the length of the opposite side to the hypotenuse, emphasizing the hypotenuse's role as a reference side when calculating trigonometric values.

In right triangles, the other two sides are referred to as the adjacent and opposite sides, which are shorter than the hypotenuse. Understanding this designation helps in correctly applying trigonometric functions and solving problems related to right triangles. The other options do not accurately define the hypotenuse, either referring to the opposite characteristics or suggesting a side that does not fit the specific definition of the hypotenuse in a right triangle context.