CPM Homework Banner

Home > CC3 > Chapter 9 > Lesson 9.2.2 > Problem 9-79


Calculate the value of . Homework Help ✎

  1. An exterior angle of a triangle is equal to the sum of the two remote interior angles.

  1. Notice that the  angle corresponds to the angle adjacent to angle . This angle is complementary to angle .

    The vertical angle is equal to the angle because they are alternate interior angles on parallel lines.