Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 37
26 PRINCIPLES OF DESCRIPTIVE GEOMETRY <p is the required angle which can beseen in its true size by revolving itand the plane Q containing it aboutits traces into either coordinate. … INTERSECTIONS OF SOLIDS WITH PLANES 27 Let A and B be two straight lines not in the same plane.(Fig. 48.) The shortest distance between two points not in thesame plane is the perpendicular distance betw^een them,and only one perpendicular can be drawn terminating inthese two lines. Through one of…
Shades and shadows · Geometry, Descriptive
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