Question 111209 • AZ-Geometry A (MA201)
A triangle’s interior angles must add up to 180°. Three acute angles can do this, such as 60° + 60° + 60°, and two acute angles plus a right angle can do it, such as 45° + 45° + 90°. Two acute angles and an obtuse angle can also add to 180°, such as 40° + 40° + 100°. The choices with a right angle and an obtuse angle, or with two obtuse angles, are impossible because those angles alone add to more than 180°.
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