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Math Help - Find angle

  1. #1
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    Question Find angle

    Can someone please help me out with this problem?

    The diagonals of a rectangle ABCD intersect at O. If angle BOC=70 degree, find angle ODA.

    Thanks.....
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  2. #2
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    Have you drawn the rectangle with the diagonals?

    You are going to have an isosceles triangle.

    ODA = 90 - OBC
    Last edited by dwsmith; December 18th 2010 at 06:07 PM.
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  3. #3
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    Angle AOD= BOC ("vertical angles" theorem). Triangle AOD is an isosceles triangle so its base angles are the same and, of course, the angles in a triangle add to 180 degrees.
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