Smart, Edward Howard · London : Macmillian and Co. · leaf 107
e subtended at tJie vertexof projection by the intercept made by the given angle on the vanish-ing line of its plane. A very important particular case occurs when the apex ofthe given angle is on the vanishing line. The projection of the apex is then a point at infinity, andaccordingly the bounding… … Fig. 38. Let P be the apex of the angle as before; the planesthrough V and either bounding line of the given angle willbe cut by the plane tt in straight lines, which are each parallelto VP. It is a good exercise to draw the figure. § 4. Problem. To project any two angles into anglesof given size,…
Geometry, Projective
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