the formula used to relate the lengths of the sides in any right triangle 
| hypotenuse | the side opposite the right angle in any right triangle—the hypotenuse is the longest side in a right triangle |
| leg | in a right triangle, one of the two sides creating the right angle |
| Pythagoras | a Greek philosopher and mathematician who lived in the 6th Century BC |
| Pythagorean Theorem | the formula used to relate the lengths of the sides in any right triangle |
| right triangle | a triangle with one right angle |