Pythagorean Theorem

Let's say you are faced with a problem like: Normally you swim diagonally across the rectangular pool which is 11.6 However, today the pool is busy so you must swim the length of the pool. The width of the pool is 5.2 and the diagonal is 11.6 but you now need to determine what the length is. The image information shows you how to solve this problem using Pythagorean's Theorem.