Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 99
rallel. The only exception occurswith planes parallel to the ground line. Such planes may betested by means of their profile traces. Thus, in Fig. 130, theplane R is parallel to the plane Q, while the plane S is not. 78 DESCRIPTIVE GEOMETRY [X, § 104 104. A Line Parallel to a Plane. A straight line… … Fig. 131. drawn, however, it would be difficult to recognize the parallel-ism. Thus, in Fig. 132, both the lines A and B are parallel tothe plane B, but this fact can hardly be seen by inspection.
Geometry, Descriptive
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