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Examine the diagram at right. Assume that and are line segments, and 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 .

Two lines A, D and B, E intersect at C, creating Triangle A, B ,C, and triangle C, D, E.