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

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

    15
  2. Deriving Ceva's theorem from Menelaus's theorem | plane geometry | intermediate level

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

    15
  3. The Bevan point of a triangle | plane geometry | intermediate level

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

    31
  4. Brocard points of a triangle | plane geometry | intermediate level

    Brocard points of a triangle | plane geometry | intermediate level

    4
    1
  6. 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
  7. 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
  11. 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
  12. 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
  15. Van Aubel's theorem about cevians | plane geometry | intermediate level

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

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

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

    11
  17. 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
  19. Pascal's formula about binomial coefficients | general mathematics | intermediate level

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

    39
    1
  21. 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
  22. The Gergonne point of a triangle | plane geometry | intermediate level

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

    19
  23. The altitudes of a triangle are bisectors in the orthic triangle | plane geometry | intermediate

    The altitudes of a triangle are bisectors in the orthic triangle | plane geometry | intermediate

    14