Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 227
of knownproperties can be drawn, namely, the meridian (§ 165) andthe parallel (§ 166) which pass through the given point. (c) Planes which are tangent to points lying in the sameparallel of the surface intersect the axis at the same point. (d) The normal (§ 156) at any point of the surface lies… … Fig. 295. Problem 37. To pass a plane tangent to a sphere at a givenpoint in the surface. Analysis. Through the given point, draw two circles lyingin the surface. Draw tangent lines, one to each circle, at thegiven point. Find the plane determined by the two tangentlines. (See § 155.) Construction…
Geometry, Descriptive
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