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Math Help - Tangency of circles - proof

  1. #1
    Newbie
    Joined
    Sep 2011
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    Tangency of circles - proof

    Hi!

    Could you help me solve the following problem?

    In a convex quadrangle ABCD we have: < DAB + 2 < BCD = 180^o

    The circle inscribed in the triangle ABD i tangent to the sides AB i AD in the points M and N respectively. Prove that the circles circumscribed around triangles AMN and BCD are tangent.

    Thank you
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  2. #2
    Junior Member
    Joined
    Feb 2011
    Posts
    68

    Re: Tangency of circles - proof

    Have you drawn a sketch of the problem?
    Where exactly are you stuck?
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