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    - LOCUS
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    - PERPENDICULAR
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    - DISTANCE
    - LOCUS
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    - LOCUS
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    - LOCUS
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    - LOCUS
    - DISTANCE
  - TETRAHEDRON
    - AREA
    - VOLUME
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    - LOCUS
    - DISTANCE
  - GENERAL
    - AREA
    - VOLUME
    - OTHERS
    - LOCUS
    - DISTANCE
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  - CIRCLE
    - BISECT
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    - PERPENDICULAR
    - OTHERS
  - LINE
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    - PERPENDICULAR
    - OTHERS
  - QUADRILATERAL
    - BISECT
    - PARALLEL
    - PERPENDICULAR
    - OTHERS
  - TRIANGLE
    - BISECT
    - PARALLEL
    - PERPENDICULAR
    - OTHERS
  - OTHERS
    - BISECT
    - PARALLEL
    - PERPENDICULAR
    - OTHERS
- TRIGONOMETRY
  - CIRCLE
    - EVALUATION
    - INEQUALITY
    - RELATION
    - OTHERS
  - QUADRILATERAL
    - EVALUATION
    - INEQUALITY
    - RELATION
    - OTHERS
  - TRIANGLE
    - EVALUATION
    - INEQUALITY
    - RELATION
    - OTHERS
  - GENERAL
    - EVALUATION
    - INEQUALITY
    - RELATION
    - OTHERS
SOLUTION
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Polygon-2019-221, side, others

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작성자: komath

라벨: others, polygon, problem

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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), ...
Trigo-2007-69, tan

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<Tri-2025-2189>, hint
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<Tri-2025-2270>, general, tangent <Russia Regional Olympiad 2003>
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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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<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...
Tri-2019-1677, hint

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Tri-2020-1780, construction, general
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<Cir-2024-760>, hint Let M be the midpoint of PQ and O' S O" cuts O" at N . Quadrilaterals SMPO' and SO"QM are...
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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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Polygon-2019-221, side, others

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