Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 208
point b,the other through the vertex, o, of the cone, since the vertex isin every tangent plane (§ 162, d). The .ff-traces, s4 and s5, ofthese two lines determine HT. XIX, § 162] TANGENT PLANES 187 Case II. Hie base of the cone lies in P (Fig. 276). The baseof this cone is a circle, and the cone is… … Through the actual trace cp draw the profile trace, PQ, of thetangent plane, tangent to the profile projection of the base.From PQ are found the points, t2 on VQ, and s2 on HQ (§ 60)..Since E lies in Q, find also, if possible, the II- and F^tracesoi E. In this case the P~-trace, tu may be found,…
Geometry, Descriptive
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