CrossRatio Command
From GeoGebra Manual
Revision as of 10:51, 20 August 2015 by Markus.winkler (talk | contribs)
- CrossRatio[ <Point A>, <Point B>, <Point C>, <Point D> ]
- Calculates the cross ratio λ of four collinear points A, B, C and D, where:
λ = AffineRatio[B, C, D] / AffineRatio[A, C, D]. - Example:
CrossRatio[(-1, 1), (1, 1), (3, 1), (4, 1)]
yields 1.2