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Math Help - How to prove a Parallelogram

  1. #1
    zxe
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    How to prove a Parallelogram


    in PQRS
    PR = QS
    P and S are right angles
    how to prove PQRS is a parallelogram?
    i had proved triangle QPS is congruent to triangle RSP
    what should i do next to prove PQRS is a parallelogram?

    please help
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  2. #2
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    Clearly the line segments PQ & SR are parallel being perpendicular to the same line.
    From congruent triangles you see that PQ & SR have the same length.
    Is that enough?
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  3. #3
    zxe
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    oh thanks for help... i think i got the answer now.
    i didn't know how to prove a parallel line before

    thanks
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