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Math Help - A question about Cyclic quadrilateral

  1. #1
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    A question about Cyclic quadrilateral

    A simple looking question from class 10..i am stuck with it...can u plz help
    ABCD is a cyclic quadrilateral with centre O..Prove that AB + CD = AD + BC...O is the centre of the circle..

    Plz help with the proof...
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  2. #2
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    Are you sure it's not a tangential quadrilateral?
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