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cross ratio
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Cross-ratio Cross ratioAlthough distances and ratios of distances are not preserved under projection, the cross ratio, defined as AC/BC ∙ BD/AD, is preserved. That is, AC/BC ∙ BD/AD = A′C′/B′C′ ∙ B′D′/A′D′.
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cross ratio: References & Edit History

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Article History

Type Description Contributor Date
Deleted Web site: MathPages - Kevin Brown explains the cross-ratio in his article about ''Pascal's Mystic Hexagram''. Aug 14, 2013
Added new Web site: Cut The Knot - Cross-Ratio. Oct 10, 2007
Added new Web site: Wolfram Mathworld - Cross Ratio. Oct 10, 2007
Article added to new online database. Jul 20, 1998
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