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Home > GC > Chapter 8 > Lesson 8.3.1 > Problem 8-88


Two lines A, D and B, E intersect at C, creating Triangle A, B ,C, and triangle C, D, E.Examine the diagram at right. Assume that and . Prove that . Use the form of proof that you prefer (such as the flowchart or two-column proof format). Be sure to copy the diagram onto your paper and add any appropriate markings.  

The triangles are congruent by .