Smart, Edward Howard · London : Macmillian and Co. · leaf 78
homothetic centre, are said to be directlysimilar. P.O. D 50 PROJECTIVE GEOMETRY Referring to the Def. of § 6, Chapter III., we see thathomothetic figures are a particular case of figures in perspec-tive. For corresponding lines are parallel and the axis ofperspective is accordingly at infinity,… … Fig. 22. Two curves (or two parts of the same curve) whichpossess this property are said to be symmetrical about 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…
Geometry, Projective
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