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Math Help - How on earth do i do this circle geometry problem?!?

  1. #1
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    Exclamation How on earth do i do this circle geometry problem?!?

    Two circles intersect at A and B. The tangent to the 1st circle at A cuts the 2nd circle at C and the tangent to the 2nd circle at A cuts the 1st circle at D. Prove that triangles ABC and DBA are similar.
    Last edited by xwrathbringerx; May 22nd 2009 at 06:21 PM.
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  2. #2
    Super Member malaygoel's Avatar
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    Hi!
    It is a simple application of Alternate Segment theorem.
    read it here:Alternate Segment Theorem
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