Three Triples of Segments: Indirect Proportion
Three groups of three measured segments, their relation marked 'indirect'
Three groups of three line-segments are measured out: a 18, b 6, c 2 beside d 12, e 6, f 3, with a further set h 8, g 4, c 2. Leonardo labels the comparison 'indirect' (indirette), naming how the ratios of the two triples correspond. A word of mirror-script and further faint marks accompany the diagram and are not otherwise transcribed.
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Three triples of segments, indirect proportion
Three groups of three line-segments are laid out and measured: a 18, b 6, c 2 beside d 12, e 6, f 3, with a third set h 8, g 4, c 2. Leonardo marks the comparison 'indirect' (indirette), naming the way the ratios of the two triples correspond.