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Math Help - deductive geo

  1. #1
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    deductive geo

    The diagram shows the triangle PQR with sides PQ and PR produced to Y and Z respectively so that PQ . PY=PR . PZ . Prove that triangles PQR and PZY are similar .

    PQ/PZ=PR/PY

    is this sufficient to prove that they are similar ??
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  2. #2
    MHF Contributor red_dog's Avatar
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    You have to add that \widehat{QPR}=\widehat{ZPY}

    In this case QR is known as an "antiparallel" to YZ.
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