For each diagram below, solve for x. Explain what method you used for each problem. Homework Help ✎
The two angles are complementary, meaning they have a sum of 90°.
The two angles are supplementary (have a sum of 180°).
x = 20°
According to the Angle Sum Theorem, the sum of the interior angles of a triangle is 180°.
How did you solve part (c)? Use the same method.
x + 30 + 90 = 180
x + 120 = 180
x = 60°