Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 204
Fig. 272. … 184 DESCRIPTIVE GEOMETRY [XIX, § 162 162. Tangent Planes to Cones and Cylinders. At every pointin the surface of a cone or cylinder, a plane tangent to the sur-face can be drawn. Planes tangent to cones and cylinders can also be passed tofulfill certain other conditions. Thus, the tangent planes…
Geometry, Descriptive
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