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Mathematics, 27.12.2020 05:50 sabitams1194

Let the convex quadrilateral ABCD have ∠DAB = 90 deg. Let M and N be respectively the midpoints of BC and CD, knowing that ∠DAN = ∠NAM = ∠MAB. Prove that ∠DCB = 60 deg.

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Let the convex quadrilateral ABCD have ∠DAB = 90 deg. Let M and N be respectively the midpoints of B...
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