Question

If one angle of a triangle is equal to the sum of the other two, show that the triangle is a right triangle.

Answer 1

If two angles are x degree
Then the other is 2x
So, 2x +x+x = 180
» 4x = 180
» x = 180/4
» x = 45°
So, the other angle is 2*45= 90°

Hope it helps...