In the formula d = StartRoot (x 2 minus x 1) squared + (y 2 minus y 1) squared EndRoot, how does each subtraction expression relate to the Pythagorean theorem? Each subtraction expression represents the length of one leg of a right triangle with a hypotenuse of length d. Each subtraction expression represents the length of the hypotenuse of a right triangle with a leg of length d. Each subtraction expression represents half the length of the hypotenuse of a right triangle with a hypotenuse of length d. Each subtraction expression represents the square of the length of the hypotenuse of a right triangle with a hypotenuse of length d.