Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 206
face. Since the required tangent plane contains theelement E, find the traces sx and t-, of E. Then the Z7-traee.HQ. of the tangent plane passes through slf and is determined XIX, § 162] TANGENT PLANES 185 by the fact that HQ must be tangent to the base of the cone(§ 162, c). The trace VQ is now… … Fig. 274. passes through the //-trace, s2, of F, and is tangent to the baseof the cone. The F-trace, VT, passes through the V-trace of F,but this point is inaccessible. Recourse must be had to someauxiliary line lying in the plane T, and so situated that itsF-trace is accessible. (See § 108.) As HT…
Geometry, Descriptive
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