Möbius Tranformations, the Cross Ratio, and Ptolemy's Theorem
Автор: Alejandro Fermin
Загружено: 2026-02-17
Просмотров: 11
Описание: We use Möbius transformations and the cross ratio of complex numbers for a proof of Ptolemy's Theorem which states that 4 vertices of a quadrilateral all lie on a circle if and only if the product of a pair of opposite sides of the quadrilateral plus the product of the other pair of opposite sides equals the product of the diagonals.
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