Higbee, F. G · New York, John Wiley & Sons · leaf 78
on/, Article 23.) Find where this Hne pierces plane Tby Article 56. p is the plan and p the elevation of this piercingpoint. Then op is the plan and op is the elevation of theshortest distance from the apex of the pyramid to the plane ofits base. Its true length may be found by Article 38, as… … Fig. 55.. 59. Corollary. Given a plane, the plan and elevation of theprojection of a point upon this plane, and its distance from theplane to find the plan and elevation of the point. Discussion. If a perpendicular be erected to the given planethrough this given projection of the point, the…
Geometry, Descriptive
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