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<Tri-2025-2239>, general, excenter

작성자: komath

라벨: angle, general, problem, triangle

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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-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-2024-2143>, collinear, general <Dutch IMO TST 2012>
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<Tri-2023-2062>, hint
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<Solid-2024-248>, hint Suppose TB=TC, isosceles, and <CTD=90, CTD is right triangle and TT' is height of TABCD, O is center of...
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<Tri-2025-2185>, hint Suppose incircle of ABC touches BC, CA, AB at D,E,F respectively Consider trianges IDP, IEN, IFM which are cong...
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