Lange, David C. (David Christoph) · New York, John Wiley & sons, inc.; [etc., etc.] · leaf 36
rpen-dicular to a given line. Let a be the given point and A the given line. (Fig.44.) The V and H Traces of the required plane are per-pendicular to the V and H Projections of the given line.(Art. 18.) The direction of each of the required traces is, there-fore, known; and if a straight line is… … 24 PRINCIPLES OF DESCRIPTIVE GEOMETRY of the required plane. (Art. 16.) Therefore, a tracethrough the point thus found, and perpendicular to thecorresponding projection of the given line, is one of therequired traces of the required plane. The other tracemeets it in the GL, and is perpendicular to…
Shades and shadows · Geometry, Descriptive
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