BEST theorem

The best theorem is one called the Pythagorean Theorem. It is a really important math rule that helps us to figure out the lengths of the sides of a triangle. It says that in any triangle, the square of the longest side (the one that forms the right angle) is always equal to the sum of the squares of the other two sides. To put it another way, if you add up the squares of two sides of a triangle, then the sum of those squares will always be the same as the square of the longest side.