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Qua-2021-658, hint

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작성자: komath

라벨: quadrilaterals, solution

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Qua-2021-656, area, square

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(no title)

<Cir-2024-769>, tangent <Dutch M.O 2004>
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<Tri-2024-2115>,parallel, general <Dutch M. O 1972>
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<Tri-2024-2111>, orthocener, parallel general <Mexico national O. 2017>
(no title)

<Cir-2023-754>, hint B,M,X,C are concyclic <MBC=<XMC=<DAC Similarly <XDC=<XNC=<BEC Hence triangles XMN and YAE are...
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<Tri-2025-2183>, isosceles, angle <Romania TST 2021>
(no title)

<Tri-2024-2123>, hint Let the intersection of PB with MC be R. Line R meets BC at Q Then by Ceva's theorem CP/PA x AM/MC x BQ/QC=1...
(no title)

<Tri-2023-2062>, hint
(no title)

<Cir-2024-760>, angle <Mexico national O. 2016>
(no title)

<Cir-2024-759>, general, concurrent <Mexico National O 2014>

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Qua-2021-658, hint

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