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


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

  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.

Triangle, A B C, where side, B C, extends out from point C, to point D, on the extending ray.