Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 212
lies in V, draw VQ tangent to the basefrom the F-trace, t, of B. The trace HQ passes through the#-trace, s, of B (§ 98). A second tangent plane T (HT, VT)is similarly obtained. XIX, § 162] TAXGEXT PLAXES 191 Cask II. TJie base of the cone does not lie in H or V(Fig. 279). The base of the cone here… … Fig. 279. the line J (Jh, Jv) tangent to the base of the cone. Therequired tangent plane, Q, may now be passed through thelines B and ,/ (Prob. 6, § 10(5). For this plane no auxiliarylines are needed. Draw also from c the tangenl line A(AA, A). Then a second tangent plane is determined by thelines…
Geometry, Descriptive
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