Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 116
POINTS, LINES, AND PLANES 97 angle with the plane B. It is the line cut out of ^ by a planeperpendicular to both A and B, and hence perpendicular to theirintersection. Thus in Fig. 97, ab is the line of greatest declivityof the plane Y with respect to H. Let it be required to draw the line of… … 5(c L^/H
Geometry, Descriptive
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