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Quarilateral vertex reflection (Posted on 2021-08-04) Difficulty: 3 of 5
Each vertex of the convex quadrilateral of area S is reflected symmetrically with respect to the diagonal not containing this vertex. Let's denote the area of the resulting quadrilateral by S'. Prove that S'/S <3.

No Solution Yet Submitted by Danish Ahmed Khan    
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  Subject Author Date
Some ThoughtsProof for rectanglesJer2021-08-06 12:57:12
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