a^2 + b^2 = c^2
7^2 + 7^2 = c^2
49 + 49 = 98
square root of 98 = 98/2 = 49 = 7
C
aka use the Pythagorean Theorem
The easier way is You see how it is a right triangle which also means that all the sides have the same length so the hypotenuse have to be 7
