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  1. Brocard points of a triangle | plane geometry | intermediate level

    Brocard points of a triangle | plane geometry | intermediate level

    4
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  3. Deriving Menelaus's theorem from Ceva's theorem | plane geometry | intermediate level

    Deriving Menelaus's theorem from Ceva's theorem | plane geometry | intermediate level

    34
  4. The second Fermat-Torricelli point of a triangle | plane geometry | intermediate level

    The second Fermat-Torricelli point of a triangle | plane geometry | intermediate level

    17
  8. The first Fermat-Torricelli point of a triangle | plane geometry | intermediate level

    The first Fermat-Torricelli point of a triangle | plane geometry | intermediate level

    18
  9. Reflections of orthocenter with respect to sides of triangle | plane geometry | intermediate level

    Reflections of orthocenter with respect to sides of triangle | plane geometry | intermediate level

    19
  12. Van Aubel's theorem about cevians | plane geometry | intermediate level

    Van Aubel's theorem about cevians | plane geometry | intermediate level

    31
    2
  13. The sum of angles of a polygon | plane geometry | intermediate level

    The sum of angles of a polygon | plane geometry | intermediate level

    11
  14. Reflections of line passing through orthocenter of triangle | plane geometry | intermediate level

    Reflections of line passing through orthocenter of triangle | plane geometry | intermediate level

    38
    1
  17. The sum of angles of a 5-pointed star | plane geometry | intermediate level

    The sum of angles of a 5-pointed star | plane geometry | intermediate level

    26
  18. The Gergonne point of a triangle | plane geometry | intermediate level

    The Gergonne point of a triangle | plane geometry | intermediate level

    19
  19. The sum of the binomial coefficients | general mathematics | intermediate level

    The sum of the binomial coefficients | general mathematics | intermediate level

    26
  20. 🇨🇳👂 Efficient Chinese Listening Training - Intermediate Level

    🇨🇳👂 Efficient Chinese Listening Training - Intermediate Level

    25
  21. Pascal's formula about binomial coefficients | general mathematics | intermediate level

    Pascal's formula about binomial coefficients | general mathematics | intermediate level

    39
    1
  22. Bisectors of angles between opposite sides of a cyclic quadrilateral | plane geometry | intermediate

    Bisectors of angles between opposite sides of a cyclic quadrilateral | plane geometry | intermediate

    23
  23. De Longchamps theorem about perpendicular bisectors of angle bisectors | geometry | intermediate

    De Longchamps theorem about perpendicular bisectors of angle bisectors | geometry | intermediate

    12
    1