Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 103
contains a given lineand a given point. Analysis. Through the given point, draw an auxiliary lineparallel to the given line, thus reducing the problem to one oftwo parallel lines. Or, assume any point on the given line,and draw an auxiliary line through this point and the givenpoint, thus reducing… … Fig. 140. (§ 93), and the required plane Q is passed through the linesA and B. In Fig. 141 the line A is parallel to V\ hence the directionof VQ is known to be parallel to Av (§ 102). But as neitherA nor B has a F-trace, a point on VQ is determined by notingwhere HQ intersects GL. Corollary II. To…
Geometry, Descriptive
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