Answer:
B. right riangle
Explanation:
Pythagorean theorem: the sum of the squares on the legs of a right triangle is equal to the square on the hypotenuse
so 25^2 = 15^2 + 20^2
625 = 225 + 400
625 = 625
So the above triangle meets Pythagorean theorem's criteria. Therefore it is a right triangle.