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| One step towards Regularity (Posted on 2019-03-05) |
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Let ABCD be a convex quadrilateral. Also let P, Q, R, S be the respective midpoints of sides AB, BC, CD, DA such that triangles AQR and CSP are both equilateral.
Find the largest angle of quadrilateral ABCD.
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 | Solution? | armando | 2019-03-08 11:07:58 |
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