The sides of right-angled triangles are labelled opposite, hypotenuse and adjacent. Trigonometry explores the relationship between sides and angles in right-angled triangles. The hypotenuse is the ...

What it means is that in a right triangle (where one angle equals 90°), the sum of the squares of two sides equals the square of the hypotenuse (the longest side).

Sine and cosine are ratios that are defined in the context of a triangle's right angle, and they can be presented according ...

It states that in a right-angled triangle, the sum of the squares of the two shorter sides equals the square of the hypotenuse. Despite thousands of proofs—ranging from Euclid to modern ...