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  1. The symmedians and the tangential triangle of a triangle | plane geometry | advanced level

    The symmedians and the tangential triangle of a triangle | plane geometry | advanced level

    21
  2. The Lemoine point of a triangle | plane geometry | advanced level

    The Lemoine point of a triangle | plane geometry | advanced level

    17
  3. Van Aubel's theorem about cevians | plane geometry | intermediate level

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

    31
    2
  4. 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
  6. The circumcenter of a triangle | plane geometry | elementary level

    The circumcenter of a triangle | plane geometry | elementary level

    29
  7. The cyclic quadrilateral formed by the external bisectors of a quadr. | geometry | intermediate

    The cyclic quadrilateral formed by the external bisectors of a quadr. | geometry | intermediate

    33
  8. Arithmetic derivative: an introduction | number theory | advanced level

    Arithmetic derivative: an introduction | number theory | advanced level

    12
  9. MUST WATCH! Dr. Peter McCullough Interviews Roman Bystrianyk: The Forgotten History Of Vaccines

    MUST WATCH! Dr. Peter McCullough Interviews Roman Bystrianyk: The Forgotten History Of Vaccines

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    212
  12. The two tangents to a circle from a point are equal to each other | plane geometry | elementary lev.

    The two tangents to a circle from a point are equal to each other | plane geometry | elementary lev.

    54
  13. Terrence Howard Unveils 6000-Year-Old Secret (WOW!)

    Terrence Howard Unveils 6000-Year-Old Secret (WOW!)

    32
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    3.25K
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  17. Tangent lengths to the incircle and the excircle | plane geometry | intermediate level

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

    42
  18. The sum of angles of a triangle | plane geometry | elementary level

    The sum of angles of a triangle | plane geometry | elementary level

    42
    1
  19. The cyclic quadrilateral formed by the bisectors of a quadrilateral | plane geometry | intermediate

    The cyclic quadrilateral formed by the bisectors of a quadrilateral | plane geometry | intermediate

    15
  20. The sum of angles of a polygon | plane geometry | intermediate level

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

    11
  21. The Gergonne point of a triangle | plane geometry | intermediate level

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

    19
  23. The power of the adjacency matrix of a graph as the numbers of paths between vertices

    The power of the adjacency matrix of a graph as the numbers of paths between vertices

    18