Cross-Ratio Four Points
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The cross-ratio of four points in a line is equal to the cross-ratio of their projections on any other line which lies in the same plane with it.
Keywords
parallel lines, cross-ratio, cross-product, harmonic range, Chasles, anharmonic ratio, transversalGalleries
Geometric Theorems and ProofsSource
Encyclopaedia Britannica (New York: The Encyclopaedia Britannica Company, 1910) 11:691
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