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October 24th, 2012, 12:11 PM  #1 
Newbie Joined: Oct 2012 Posts: 1 Thanks: 0  Sphere inscribed in pyramid
In SABCD pyramid, which is based on a convex quadrilateral ABCD, you can inscribe the sphere. Prove that : <) ASB + <) CSD = <) BSC + <) DSA 

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