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Math Help - Prove: Theorem 9-11 (HELP)

  1. #1
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    Cool Prove: Theorem 9-11 (HELP)

    It's all about proving.
    This is the question:

    Prove: Theorem 9-11. If both pairs of opposite sides of a quadrilateral are congruent then the quadrilateral is a parallelogram.
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  2. #2
    Senior Member abhishekkgp's Avatar
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    draw the diagonal of the quad.
    the two triangles appearing will be found to be congruent and the rest follows easily.
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