March 2nd, 2014, 11:35 AM  #1 
Newbie Joined: Feb 2014 Posts: 26 Thanks: 0  Geometry problem
Hello! Please help me with this problem. A trapezoid ABCD(ABCD;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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