Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 95
t of intersection is outside the limits of the draw-ing (Fig. 122), the test fails. In this case take any two points,d and e, on A, and any two,/ and g, on B. Then if A and Bintersect, df and eg (or else dg and ef) will intersect. 74 DESCRIPTIVE GEOMETRY [X, § 96 96. A Line in a Plane. If a line… … Fig. 123. Fig. 124. the line in which Q intersects H; and the intersections withH are the respective traces of the line and plane. Similarlyfor any other plane of projection. 97. To Locate a Line in a Plane. A line will lie in a givenplane if the line passes through two points which lie in…
Geometry, Descriptive
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