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  1. Upper bound on chromatic number of graph in terms of number of edges | graph theory | elementary

    Upper bound on chromatic number of graph in terms of number of edges | graph theory | elementary

    28
  3. The incenter of a triangle | plane geometry | elementary level

    The incenter of a triangle | plane geometry | elementary level

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

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

    37
    2
  6. Deriving Ceva's theorem from Menelaus's theorem | plane geometry | intermediate level

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

    17
  7. 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
  11. Cyclic quadrilaterals (= inscribed quadrilaterals) | plane geometry | elementary level

    Cyclic quadrilaterals (= inscribed quadrilaterals) | plane geometry | elementary level

    16
  13. Proper colorings and the chromatic number of graphs | graph theory | elementary level

    Proper colorings and the chromatic number of graphs | graph theory | elementary level

    32
  15. The Gergonne point of a triangle | plane geometry | intermediate level

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

    21
  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

    40
    1
  22. The Nagel point of a triangle | plane geometry | intermediate level

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

    4
  24. BATTLE FOR THE GETTY - Underground Bunker - # OCCUPY THE GETTY @Steven D Kelley

    BATTLE FOR THE GETTY - Underground Bunker - # OCCUPY THE GETTY @Steven D Kelley

    14
    0
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