Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 213
). 192 DESCRIPTIVE GEOMETRY [XIX, § 162 Problem 33. To pass a plane tangent to a cone parallel to agiven line. (Two results.) Analysis. The required tangent plane must contain the ver-tex of the cone (§ 162, d). Moreover, since it is to be parallelto a given line, the plane must contain a line… … Fig. 280. pass a line parallel to the given line. Pass the requiredtangent planes through this line. For the method of accom-plishing this, see the preceding Problem. Construction. Case I. The base of the cone lies in H or V(Fig. 280). The base of the given cone lies in V. The givenline is A.…
Geometry, Descriptive
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