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Trigo-2007-56, square

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작성자: komath

라벨: problem, relation, triangle, Trigonometry

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<Tri-2025-2225>, hint On line BC, MD extended intersect line BC at E. Draw a line , parallel to MDE, cutting line BCE at F. Triangles ...
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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-2024-2092?>. hint 1> L,M,N are centroids of triangles PBC, PCA, PAB [PELF]=[PEL]+[PFL]=1/3 [PBC] 2. Suppose PL,PM,PN cut sid...
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<Tri-2025-2183>, isosceles, angle <Romania TST 2021>
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<Solid-2025-257>, hint Let O be the center of circumscribed sphere of ABCD, and let vectors OA=a, OB=b, OC=c, OD=d. P=t(a+c)/2+(1-t)(b...
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<Tri-2024-2143>, hint Let PK extended cut line BN in L', AK extended meet BL' in N, <BNK=90. Since ABPK are concyclic...
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Trigo-2007-56, square

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