Find the hypotenuse of a 45-45-90 Triangle

Because the sum of the angle measures in a triangle is 180 degrees the measure of the third angle is 45 degrees. So,the triangle is a 45-45-90 triangle,and by therorem 5.1 ,the hypotenuse is 2 times as long as each leg

hypotenuse = leg * 2 x=11*2
45-45-90 Triangle theoreom substitute