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  1. 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
  2. Cyclic quadrilaterals (= inscribed quadrilaterals) | plane geometry | elementary level

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

    14
  4. The sum of angles of a triangle | plane geometry | elementary level

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

    42
    1
  5. The set of integer numbers is countable | set theory | elementary level

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

    8
  6. Tangential quadrilaterals, the sums of opposite sides, Pitot's theorem | plane geometry | elementary

    Tangential quadrilaterals, the sums of opposite sides, Pitot's theorem | plane geometry | elementary

    35
  7. Proper colorings and the chromatic number of graphs | graph theory | elementary level

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

    25
  8. 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

    26
  10. A median in a right triangle | plane geometry | elementary level

    A median in a right triangle | plane geometry | elementary level

    4
  11. The set of rational numbers is countable | set theory | elementary level

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

    5
  12. The Rosicrucian Mysteries: An Elementary Exposition of Their Secret Teachings by Max Heindel (1911)

    The Rosicrucian Mysteries: An Elementary Exposition of Their Secret Teachings by Max Heindel (1911)

    3
    0
    357
  13. Lagrange's mean value theorem | mathematical analysis | elementary level

    Lagrange's mean value theorem | mathematical analysis | elementary level

    14
  14. The circumcenter of a triangle | plane geometry | elementary level

    The circumcenter of a triangle | plane geometry | elementary level

    29
  15. Fermat's theorem (stationary point theorem, interior extremum theorem) | math analysis | elementary

    Fermat's theorem (stationary point theorem, interior extremum theorem) | math analysis | elementary

    14
  16. 33rd Annual elementary science Olympiad tournament

    33rd Annual elementary science Olympiad tournament

    3
  17. The Sacraments of Science: Radiometric Dating and the Fossil Record - Quirks of Creation Ep. 11

    The Sacraments of Science: Radiometric Dating and the Fossil Record - Quirks of Creation Ep. 11

    26
    0
    1.55K
    13
  18. The orthocenter of a triangle | plane geometry | elementary level

    The orthocenter of a triangle | plane geometry | elementary level

    25
  20. Elementary students in Grandview built Science City's newest exhibit: 'The Amazing Brain'

    Elementary students in Grandview built Science City's newest exhibit: 'The Amazing Brain'

    25
  22. Elementary Reactions, Unimolecular, Bimolecular, Termolecular - Chemistry

    Elementary Reactions, Unimolecular, Bimolecular, Termolecular - Chemistry

    39