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Home > CC3 > Chapter 9 > Lesson 9.2.3 > Problem 9-96

9-96.
  1. For each diagram below, solve for x. Explain what method you used for each problem. Homework Help ✎

  2. a.

    b.

    c.

    d.

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°