Respuesta :

triciaal
pythagorean theorem 
c^2 = a^2 + b^2 where c is the hypotenuse of a right-angle triangle: a and b are the legs. 
c^2 = 7^2 + 9^2 = 49 + 81 = 130
c, diagonal = √130  unit of measure feet 
You do 7 feet times 9 feet and get your answer, The answer is 63 feet because 7 times 9 = 63