The third angle of the triangle is 130° and the triangle is an obtuse-angled triangle.
The sum of all angles in a triangle is equal to 180°
If the measure of one angle is 20° while the other angle measures 30°. Then the measure of the third angle would be,
Third angle = 180° - (20° + 30°) = 180° - 50° = 130°
Thus, the measure of all sides of the triangle is 20°, 30° and 130°
Since in the given triangle one of the sides measures more than 90° then definitely the triangle can be considered as the obtuse-angled triangle.