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  1. 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
  2. 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
  3. 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
  4. Segments at equal angles from the opposite sides of a cyclic quadrilateral | geometry | intermediate

    Segments at equal angles from the opposite sides of a cyclic quadrilateral | geometry | intermediate

    24
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  5. The tangential quadrilateral formed by centers of 4 tangent circles | plane geometry | intermediate

    The tangential quadrilateral formed by centers of 4 tangent circles | plane geometry | intermediate

    9
  6. 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

    31
  7. 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
  8. Cyclic quadrilaterals (= inscribed quadrilaterals) | plane geometry | elementary level

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

    12
  9. 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

    32
  10. 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

    32
  11. 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