Descriptive Geometry (Classic Reprint): A Treatise From a Mathematical Standpoint, Together With a Collection of Exercises and Practical Applications - Tapa blanda

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Excerpt from Descriptive Geometry: A Treatise From a Mathematical Standpoint, Together With a Collection of Exercises and Practical Applications

As an illustration of the generalized treatment throughout, attention may be called to the discussion of the cone. A common conception of a cone is that of a right circular cone, or cone of revolution. A generalized definition is given, however, to include all the surfaces which may be generated by a right line moving so as to pass through a fixed point and touch a curve. Further, it is stated that every cone is generically a right cone, and may be specifically named from the shape of a cross section so taken that a perpendicular, let fall from the fixed point or apex to the plane of the section, will pierce the latter in the center, focus, or other characteristic point, as a cusp, point of inflection, etc., etc.

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