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March 2nd, 2014, 11:35 AM   #1
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Geometry problem

Hello!
Please help me with this problem.
A trapezoid ABCD(AB||CD;AB>CD) is inscribed in circle C_1(O_1) and is escribed in circle C_2(O_2).Prove that:
O_1 O_2=((AB)^2-(CD)^2)/(8?(AB×CD)).
Thank you!
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