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Math Help - Prove This!

  1. #1
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    Exclamation Prove This!

    State the theorem or principal that enables you to prove or deduce that quadrilateral PQRS is a parallelogram.

    Please explain how you get to the answer. problems like these are going to be on my midterm and I need to know how to solve them Thank you so much for any help!

    Line PQ is congruent to Line SR; Line PQ is parallel to Line SR:____________

    Line PQ is parallel to Line SR; Line PS is parallel to Line QR: _______________

    Angle PSR is congruent to Angle RQP; Angle SQR is congruent to Angle QPS: _______________________

    Line PQ is congruent to Line SR; Line PS is congruent to Line QR:_______________________

    PA = 1/2 Of PR; SA = 1/2 Of SQ: _______________________________
    Attached Thumbnails Attached Thumbnails Prove This!-pqsr.jpg  
    Last edited by IHATECHONGAS; May 2nd 2007 at 06:44 AM.
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  2. #2
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    If anyone could please explain the process I would really appreciate it! Please and thank you a million times!
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  3. #3
    Super Member malaygoel's Avatar
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    A given quadrilateral is a parallellogram if any of these conditions is true:
    ->Opposite sides are equal
    ->Opposite sides are parallel
    ->Opposite angles are equal
    ->Diagonals bisect each other

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    Malay
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