Can someone please help me find the value of t!

Can any one me with the answers to these questions asap?

What is the measure of angle tvu shown in the diagram below

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