Need help to solve this question

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x, y) ?

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

8.74 rounded to the nearest whole number