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<Tri-2025-2193>, general, orthocener

작성자: komath

라벨: center, general, problem, triangle

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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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<Solid-2025-261 >, hint Let P on AB, Q on BC, R on,CD, S on DA such that PQRS is a rhombus. For PS//QR, PQ//SR, AP/PB=x/(1-x), ...
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<Tri-2024-2143>, collinear, general <Dutch IMO TST 2012>
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<Tri-2023-2062>, hint
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<Tri-2025-2183>, hint Suppose AM cuts the circumcircle of ABC at O and I is incenter of ABC. Since <OBI=<OIB=<OCI, O is the c...
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<Tri-2025-2183>, isosceles, angle <Romania TST 2021>
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<Tri-2023-2079>, hint Radical axis theorem

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