Smart, Edward Howard · London : Macmillian and Co. · leaf 119
e completed by using the principlesthat the joins of corresponding points are perpendicular to xand the intersections of corresponding sides are on x. ABjCj is the triangle required. § 13. Orthogonal Projection of an Area. We shall conclude this chapter with an important theoremwhich will be needed… … Pio. 46. Divide the area and its projection into narrow stiips byplanes perpendicular to the axis of projection.Let PQRS, jp^r8 (Fig. 46) be a strip and its projection. 92 PROJECTIVE GEOMETRY From P, Q, R, S, p, q, ?, s draw parallels PP, ..., pp... tothe axis of projection, forming thus rectangles…
Geometry, Projective
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