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Home > CC4 > Chapter 8 > Lesson 8.2.3 > Problem 8-122


Use the relationships in the diagrams below to solve for , if possible. If it is not possible, state how you know. If it is possible, justify your solution by stating which geometric relationships you use.   Homework Help ✎

  1. 2-116a diagram

    The angles in a triangle sum to .
    So, .

  1. 2-116b diagram

  1. 2-116c diagram

    How can you use the parallel lines to find an angle within the triangle?