Smart, Edward Howard · London : Macmillian and Co. · leaf 39
jection required. It must be further noted that the straight line and itsprojection cut the axis of projection at the same point, viz.where /? cuts it. It is important to bear this fact in mind when we come tothe drawing of projections. It is also evident that the distance between two points andthe… … Let the triangle ABC be projected on to another plane andlet its projection be AjBjCj. Let V be the vertex of projection. (Fig. 2h.) 12 PROJECTIVE GEOMETRY Then BC, BjC^ intersect one another, for they lie in a planethrough V. But the only common part of the planes ABC,AjB,C, (in which these lines…
Geometry, Projective
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