Pythagorean Triples are 3 whole numbers such that a^2 + b^2 = c^2 The biggest number must be the 'c' because it is across from the 90 degree angle and therefore the longest side. 6^2 + 8^2 ?=? 10^2 36 + 64 ?=? 100 100 = 100 This is true so 6,8,10 is a Pythagorean triple. 5^2 + 12^2 ?=? 13^2 25 + 144 ?=? 169 169 = 169 This is true so 5,12,13 is a Pythagorean triple.