Part A we are given the legs and are looking for the hypotenuse Part B 37^2 + 71^2 = c^2

Part C 37^2 + 71^2 = c^2

961+5041 = c^2

6002 = c^2

Take the square root of each side

sqrt(6002) = sqrt(c^2)

77.47257579=c

c = 77

Part D The size is 77 inches