Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 94
Fig. 120. with the common projection. Such lines are either intersect-ing, as in the figure, or parallel (§ 92). X, § 95] LINES IN A PLANE 73 95. Test for Intersecting Lines. Conversely, if the correspond-ing projections of two lines intersect in the same projector, thelines in space intersect. The… … Fig. 121. the lines is a profile line; thus, the line E, Fig. 121, does notintersect the profile line ab, since the point c, in which E piercesthe profile plane containing ab, does not lie on the line ab.
Geometry, Descriptive
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