Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 214
the base of the cone. The trace HQ passes throughthe i?-trace, sx, of B. For a second result, from tx draw VTtangent to the base of the cone. Since VT does not intersect XIX, § 162] TANGENT PLANES 193 GL within reach, an auxiliary line is needed to locate HT.But VT is so nearly parallel to GL that… … Fig. 281 element of tangency, which must lie in the plane T. Hencethe //-trace, s2, of E lies in JIT, which is now determined by s2and the //-trace, su of B. Case II. The base of the cone does vot lie in. II or V(Fig. 281). The base of the given cone lies in the plane X,perpendicular to V. The…
Geometry, Descriptive
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