The length of the 3rd side of the right triangle?

78.7, because 51 times 51 = 2601 and 60 times 60=3600 when you add them you get 6201, and when you square root that you get 78.7. it is the largest number because it is the hypotenuse and since it is a right triangle you can use pythagorean theorem which is a^2 + b^2 = c^2