The sum of the exterior angles of all polygon is always equal to 360°. The exterior angle sharing the same side with that of the right angle of the triangle is equal to 90°. If the other exterior angles are 13x and 14x then, they add up to 270°.
The equation that would allow us to determine the values of the angles are, 13x + 14x = 270 x = 10 The exterior angles are 130 and 140°. The exterior angle and the interior angle always add up to 180°.