The give side measures are 30, 40, 50.

Since the measure of the longest side is 50, So let c = 50, a = 30 and b = 40.

Then apply Pythagorean theorem: .

           (Substitute c = 50, a = 30 and b = 40)

Evaluate powers: .

Since , the triangle is right triangle.

The measures , the triangle is right triangle.