he Pythagorean theorem is a very well known formula used to find the length of one side of a right triangle when the lengths of the other two sides are known. To learn more about this formula, A2 + B2 = C2, and it's uses, watch the following short video:
A shortcut to using the Pythagorean theorem to set-up and solve an equation to find the length of one side of a right triangle is learning what are known as Pythagorean triples. Here is some additional useful information on Pythagorean triples: