I'm not sure how to solve this (it would be more for a way to solve it rather than an answer)

For it to form a right triangle, it would satisfy the pythagorean theorem
a^2 + b^2 = c^2where a and b are the legs and c is the hypotenuse...keep in mind, the hypotenuse is the biggest side.

so lets check it...
a^2 + b^2 = c^2
57^2 + 76^2 = 95^2
3249 + 5776 = 9025
9025 = 9025 (correct)

and since it satisfies the pythagorean theorem, it is a right triangle