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Home > CCG > Chapter 7 > Lesson 7.2.3 > Problem 7-77

7-77.

In the diagram below, is referred to as an exterior angle of because it lies outside the triangle and is formed by extending a side of the triangle. Homework Help ✎

diagram

  1. If and , what is ? Show all work.

    How do the angles of a triangle relate to each other? How will this help you solve for ?

    Then how are and related?

  2. If and , then what is ?

    Use similar methods to those used for part (a). The methods might be used in a different order.