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Math Help - parallelogram

  1. #1
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    parallelogram

    ABCD be a parallelogram. Let O be the point of intersection of its diagonals

    if < ABC = < COD






    proof that ABCD be asqure
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  2. #2
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    Might be dificult to prove, since it isn't true.
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  3. #3
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    parallelogram posted by perash

    identify the two acute angles at B as a and b. < COD =<a +b given.label all angles of the figure in terms of a,b,c using the equality of coresponding angles.you can show the angles of triangle AOB add up to 2a+2b=180 so a+b=90



    bj
    Last edited by bjhopper; April 9th 2008 at 05:25 AM. Reason: left out proof of square
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  4. #4
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    ::cough:: ::cough::
    Attached Thumbnails Attached Thumbnails parallelogram-parallelogram.bmp  
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  5. #5
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    Ok, my friend had to check his demo again and it doesn't work anymore
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