Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 211
ane. A tangent to the base 190 DESCRIPTIVE GEOMETRY [XIX, § 162 which intersects this line must also lie in the required tangentplane. But a line tangent to the base must lie in the plane ofthe base, hence it can be drawn only from that point of thefirst line in which it intersects the plane of the… … Fig. 278. drawn from this trace becomes the if-trace of the tangentplane (§ 162, c). The construction is similar if the baselies in V. Construction. Case I. TJie base of the cone lies in H or V(Fig. 278). The base of the cone here given lies in V, and a(ah, av) is the given point. Draw the line B…
Geometry, Descriptive
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