Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 233
ine A and the tangent line F. An alternative method for determining the plane T is alsoshown in Fig. 298. From o draw the line N perpendicular to F.This line lies in the plane X, and passes through the point oftangency of F and the sphere. The line N is thus the normalto the tangent plane T. Hence… … Fig. 298. XX, §171] SURFACES OF REVOLUTION 213 another line, but the relative positions of the lines A and JVare such in this case that it may be done. Construction (Fig. 299). Let A be the given line, and o thecenter of the given sphere. Find the plane, X, which con-tains o and is perpendicular to…
Geometry, Descriptive
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