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Home > CC3 > Chapter 9 > Lesson 9.1.2 > Problem 9-21

9-21.

Find the measure of the missing angle in each triangle below and then classify the triangle as acute, right, or obtuse.  Homework Help ✎

  1. 9-21 (a) triangle

    Angle and the angle are complementary.

  1. 9-21 (b) triangle

    The sum of the interior angles in a triangle is always .