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        riddles >> medium >> Tangential Quadrilateral
        
(Message started by: O2009 on Oct 18^th, 2009, 9:56pm)

Title: Tangential Quadrilateral
Post by O2009 on Oct 18^th, 2009, 9:56pm

Prove that in a tangential quadrilateral (one that has an incircle), the intersection of the diagonals is collinear with each pair of opposite points of tangency.