Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. Release your mouse button when the item is place. If you change your mind, drag the item to the trashcan. Click the trashcan to clear all your answers. The Pythagorean theorem describes the relationship between the lengths of legs a and b and the hypotenuse c of any right triangle.

a 2 + b 2 = c 2

Complete the equation below by writing an expression equivalent to the length of a, the leg of a right triangle.