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Butterfly theorem information


Butterfly theorem

The butterfly theorem is a classical result in Euclidean geometry, which can be stated as follows:[1]: p. 78 

Let M be the midpoint of a chord PQ of a circle, through which two other chords AB and CD are drawn; AD and BC intersect chord PQ at X and Y correspondingly. Then M is the midpoint of XY.

  1. ^ Johnson, Roger A., Advanced Euclidean Geometry, Dover Publ., 2007 (orig. 1929).

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