and 5 units always created a right triangle. The Pythagoreans found that in 3-4-5 triangles, the area of the square of the hypotenuse equals the sum of the areas of the squares of the other two sides.

Trigonometry explores the relationship between sides and angles in right-angled triangles. The hypotenuse is the longest side and is always opposite ... each triangle is 3/5 and 6/10.