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  1. Vandermonde's identity about binomial coefficients | general mathematics | intermediate level

    Vandermonde's identity about binomial coefficients | general mathematics | intermediate level

    37
  2. Hockey-stick identity | general mathematics | intermediate level

    Hockey-stick identity | general mathematics | intermediate level

    36
  4. The sum of the binomial coefficients | general mathematics | intermediate level

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

    28
  5. 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
  6. BEST FULL BODY EXERCISE 💯 Burpees For Every Fitness Level

    BEST FULL BODY EXERCISE 💯 Burpees For Every Fitness Level

    86
    22
    187
    1
  8. A surprising usage of derivatives to calculate certain sums of binomial coefficients | intermediate

    A surprising usage of derivatives to calculate certain sums of binomial coefficients | intermediate

    28
  9. 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
  13. The sum of angles of a polygon | plane geometry | intermediate level

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

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

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

    39
    1
  16. 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
  17. The Bevan point of a triangle | plane geometry | intermediate level

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

    32
  20. Brocard points of a triangle | plane geometry | intermediate level

    Brocard points of a triangle | plane geometry | intermediate level

    6
    1
  21. Van Aubel's theorem about cevians | plane geometry | intermediate level

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

    37
    2
  22. Inverse Pythagorean theorem | plane geometry | intermediate level

    Inverse Pythagorean theorem | plane geometry | intermediate level

    14
    1
  23. Tangent lengths to the incircle and the excircle | plane geometry | intermediate level

    Tangent lengths to the incircle and the excircle | plane geometry | intermediate level

    45
  25. Deriving Menelaus's theorem from Ceva's theorem | plane geometry | intermediate level

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

    36