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Cyclic QUAD (Posted on 2013-03-10) Difficulty: 3 of 5
Let ABCD be a convex quadrilateral. The diagonals AC and BD intersect at K. Show that ABCD is cyclic if and only if AK *sin A + CK *sin C = BK *sin B + DK *sin D

No Solution Yet Submitted by Danish Ahmed Khan    
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