Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 99
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. … Fig. 132. Fig. 133. The fact that a line is parallel to a plane can be recognized atonce only when the line is parallel to one of the systems ofprincipal lines of the plane. In Fig. 133, it is evident thatboth lines C and D are parallel to the plane S. X, § 106] PARALLEL LINES AND PLANES 79 105. A…
Geometry, Descriptive
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