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Tri-2015-1223,hint1

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작성자: komath

라벨: solution, triangle

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<Solid-2025-258>, hint Since MN is perpendicular to AB, CD, Triangle NBA , MDC are isosceles , and so NA=NB, MC=MD. Triangles CBD , CA...
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<Tri-2025-2217>, hint Consider Simson Line. Suppose M on arc AC and let N'. P', Q' be the projections of M onto lines AB, ...
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<Tri-2025-2259>, hint <A'BC+<ABC+<ABC'=3<ABC=180 (A'.B.C' are collinear) , <ABC=60 C'B=2A'B --...

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Tri-2015-1223,hint1

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