Smart, Edward Howard · London : Macmillian and Co. · leaf 106
ne of projection. Let TT be the plane of the figure and tt the plane ofprojection. Draw through V planes parallel to tt and tt, meeting re-spectively tt and TT in the lines /, /. Then / is the straight line in the plane tt which is projectedto infinity on ir, and is on this account called the… … Fig. 37. § 3. The Projection of an Angle. Let the bounding lines of the angle QPR in the plane tt cutthe vanishing line of that plane in Q and R, and let the planesVPQ, VPR cut tt in PQ, PR. Then QPR is the projectedangle. Since the plane VQR is parallel to tt, VQ and PQ,being sections of these…
Geometry, Projective
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