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geometry[CrossRatio] - compute the cross ratio (or anharmonic ratio, or double ratio) of four points
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Calling Sequence
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CrossRatio(A, B, C, F)
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Description
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Given four points A, B, C, F, the routine CrossRatio(A, B, C, F) computes the cross ratio of A, B, C, F taken in this order.
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If A, B, C, F are four distinct points on an ordinary line, the cross ratio of A, B, C, F taken in this order is defined as (SensedMagnitude(AC)/SensedMagnitude(CB))/ (SensedMagnitude(AD)/SensedMagnitude(DB))
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The command with(geometry,CrossRatio) allows the use of the abbreviated form of this command.
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