Answer:
Explanation:
The sum of three angles in a triangle is equal to 180°.
(1) 40°, 90°, 60°
40 + 90 + 60 = 190. Therefore, it could not be the measures of the three angles if a triangle.
(3) 120°, 30°, 20°
120 + 30 + 20 = 170. Therefore, it could not be the measures of the three angles if a triangle.
(2) 50°, 100°, 30°
50 + 100 + 30 = 180. Therefore, it could be the measures of the three angles if a triangle.
(4) 70°, 70°, 60°
70 + 70 + 60 = 200. Therefore, it could not be the measures of the three angles if a triangle.