Smart, Edward Howard · London : Macmillian and Co. · leaf 79
bout O.(Fig. 22.) § 13. Symmetry about a Line. Another particular case of plane perspective may be men-tioned here. If two figures (or parts of the same figure) are such thatto each point P of one of them corresponds a point P of theother such that PP is bisected at right angles by a givenstraight… … Fig. 22a. § 13. (a) Inverse Similarity. Two similar figures need not possess the property of directsimilarity. For (Fig. 23) keeping one of them X in its
Geometry, Projective
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