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  1. A theorem about two circles intersecting on the sides of a triangle | plane geometry | intermediate

    A theorem about two circles intersecting on the sides of a triangle | plane geometry | intermediate

    2
    0
    11
    1
  2. Mean Value Theorem, Derivatives - Calculus

    Mean Value Theorem, Derivatives - Calculus

    2
    0
    52
  3. Mean Value Theorem for Derivatives, Examples - Calculus

    Mean Value Theorem for Derivatives, Examples - Calculus

    67
  4. Extreme Value Theorem - Calculus

    Extreme Value Theorem - Calculus

    48
  6. Extreme Value Theorem, Extrema, Critical Points, Examples - Calculus

    Extreme Value Theorem, Extrema, Critical Points, Examples - Calculus

    33
  8. Tangent lengths to the incircle and the excircle | plane geometry | intermediate level

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

    40
  9. 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

    24
  10. Segments connecting midpoints of opposite arcs of circumcircle of quadril. | geometry | intermediate

    Segments connecting midpoints of opposite arcs of circumcircle of quadril. | geometry | intermediate

    23
  11. 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

    22
  12. 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

    23
  13. Parallelogram formed by midpoints of sides of a quadrilateral | plane geometry | intermediate level

    Parallelogram formed by midpoints of sides of a quadrilateral | plane geometry | intermediate level

    29
  15. The sum of angles of a triangle | plane geometry | elementary level

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

    39
    1
  16. Segments connecting midpoints of opposite sides of a quadrilateral | plane geometry | intermediate

    Segments connecting midpoints of opposite sides of a quadrilateral | plane geometry | intermediate

    12
  17. The set of integer numbers is countable | set theory | elementary level

    The set of integer numbers is countable | set theory | elementary level

    8
  18. The sum of angles of a polygon | plane geometry | intermediate level

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

    10
  20. 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

    30
  21. Cyclic quadrilateral formed by inscribed angle from the midpoint of an arc | geometry | intermediate

    Cyclic quadrilateral formed by inscribed angle from the midpoint of an arc | geometry | intermediate

    30
  22. The set of rational numbers is countable | set theory | elementary level

    The set of rational numbers is countable | set theory | elementary level

    5
  23. 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

    14