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