Support page to my note "On cyclic quadrilaterals and the butterfly theorem" / Darij Grinberg


References

[1] Alexander Bogomolny, The Butterfly Theorem.
[2]
Bismarck et al, MathLinks topic #38178 ("Blaikie theorem (for all friends of involutions)").
[3]
Mathservant et al, MathLinks topic #69971 ("Quadrilateral [quadrilateral bisects segment on a parallel]").
[4]
Liyi et al, MathLinks topic #5326 ("a quadrangle inscribed in a circle").
[5]
Vladimir, Quadrilateral inversions.
[6]
Pascual2005 et al, MathLinks topic #27608 ("Nice circles intersection").
[7]
Grobber et al, MathLinks topic #4919 ("diameter AB [prove MK perpendicular to OK]").
[8]
Jhaussmann5 et al, MathLinks topic #18801 ("cyclic quadrilateral and diagonals: OY perp. XY").
[9]
Juancarlos et al, MathLinks topic #15668 ("Miquel point of cyclic quadrilateral").
[10]
Juancarlos et al, MathLinks topic #15133 ("Cyclic quadrilateral property: R^2 = OP * OQ").
[11]
Max1546 et al, MathLinks topic #110196 ("Proving an angle").
[12]
Elchuy et al, MathLinks topic #110996 ("Equal segments?").
[13]
EDSON_ et al, MathLinks topic #108346 ("Tangent to circumcircle at antipode meets sideline").
[14]
Fuzzylogic et al, MathLinks topic #13061 ("A Variation of The Butterfly Problem").
[15]
Jhaussmann5 et al, MathLinks topic #18781 ("cyclic quadrilateral and line [extended butterfly theorem]").
[16]
Virgil Nicula, MathLinks topic #73560 ("About the butterfly theorem.").


On cyclic quadrilaterals and the butterfly theorem

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Darij Grinberg