Identifying Right Triangles

Question

A triangle has side lengths of 5, 12, and 13. Is this a right triangle?

Accepted Answer

Yes, because $ 5^2 + 12^2 = 13^2 $

Answer

No, because 13 is too large

Answer

Yes, because $ 5 + 12 = 13 $

Answer

Only if the angle between the sides of length 5 and 12 measures 90&#176;