Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 120
(2) when one point and thedirection of the line are known. (Compare § 108.) Problem 12. To find the line of intersection of two planes.Analysis. The traces of the required line of intersectionlie at the intersection of the corresponding traces of the given 98 XII, § 118] INTERSECTION OF PLANES 99… … Fig. 1G0. Fig. 167. A second example, with planes differently situated, is givenin Fig. 167. The general case may fail because of (a) parallel lines;(6) intersections inaccessible ; (c) points s and t coincident. Special Case I. Suppose that one pair of traces is parallel(Fig. 168). Let Q and R be…
Geometry, Descriptive
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