Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 23
ines may be measuredwhen a plane containing the lines has been revolved tocoincide with one of the Coordinate Planes. A plane is,therefore, passed through the two intersecting lines andits traces determined. This plane, with its lines, is thenrevolved about either of its traces as an axis, until it… … POINTS, LINES AND PLANES 13 25. To find the true size and shape of any plane surface.Let ahcd be the plane surface. (Fig. 27.) This plane surface appears in its true size and shapewhen the plane containing it is revolved to coincide witha Coordinate Plane. The plane, therefore, containing thegiven…
Shades and shadows · Geometry, Descriptive
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