Answer for 6,7 help pls

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

How do you solve a question like this?

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1