Question

The side lengths of a triangle are 9, 12, and 15. Is this a right triangle?

Answer 1

yes it is.

Explanation:

pythagorean theorem. A^2 + B^2 = C^2

Ex 9^2 + 12^2 = 15^2

Answer 2

Yes, this is a right triangle.

Explanation:

If you look more closely, you can notice that it is a 3-4-5 Pythagorean triple and it was multiplied by 3 to get 9-12-15.

Or you can do it using the Pythagorean Theorem directly:

9^2 + 12^2 = 15^2

and that is true.