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

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

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  3. The nine-point circle and the Euler line | plane geometry | advanced level

    The nine-point circle and the Euler line | plane geometry | advanced level

    16
  4. Reflections of orthocenter with respect to sides of triangle | plane geometry | intermediate level

    Reflections of orthocenter with respect to sides of triangle | plane geometry | intermediate level

    19
  5. 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

    22
  6. The special case of Miquel's theorem when points are collinear | plane geometry | intermediate level

    The special case of Miquel's theorem when points are collinear | plane geometry | intermediate level

    20
  7. Reflections of line passing through orthocenter of triangle | plane geometry | intermediate level

    Reflections of line passing through orthocenter of triangle | plane geometry | intermediate level

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

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

    17
  10. The circumcenter of a triangle | plane geometry | elementary level

    The circumcenter of a triangle | plane geometry | elementary level

    29
  11. 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
    13
    1
  13. One of the greatest intellectual achievements of mankind (Euclid's Elements).

    One of the greatest intellectual achievements of mankind (Euclid's Elements).

    78