Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 195
ht line,the curve is a plane curve. But if both projections of a curveare curves, the actual curve may or may not be a plane curve, so that no general rule can be given. 152. Tangent Lines. At any pointin a curve, a straight line tangent tothe curve can be drawn. The pro-jection on any plane of the… … Fig. 255. XVIII, § 154] TAXGEXT LIXES AXD PLANES 175 153. Tangents to Plane Curves. A straight line tangent to aplane curve lies in the plane of the curve. Hence, if it is required to draw a straight line tangent to aplane curve, from a point not on the curve, there is no solutionunless the given…
Geometry, Descriptive
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