Answer:
Yes.
Step-by-step explanation:
If the side lengths verify in the Pythagorean theorem, then it is a right triangle.
a² + b² = c²
15² + 20² = 25²
225 + 400 = 625
625 = 625
Since these values come out true when using the Pythagorean Theorem, this triangle is a right trinagle.
