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The axis of a cone is the straight line passing through the apex about which the cone has a circular symmetry. In common usage in elementary geometry, cones are assumed to be right circular, i.e., with a circle base perpendicular to the axis. [1] If the cone is right circular the intersection of a plane with the lateral surface is a conic section.
If C has nonempty interior, then C * is pointed, i.e. C* contains no line in its entirety. If C is a cone and the closure of C is pointed, then C * has nonempty interior. C ** is the closure of the smallest convex cone containing C (a consequence of the hyperplane separation theorem)
The term "pointed" is also often used to refer to a closed cone that contains no complete line (i.e., no nontrivial subspace of the ambient vector space V, or what is called a salient cone). [29] [30] [31] The term proper (convex) cone is variously defined, depending on the context and author. It often means a cone that satisfies other ...
The lateral area, L, of a circular cylinder, which need not be a right cylinder, is more generally given by =, where e is the length of an element and p is the perimeter of a right section of the cylinder. [9] This produces the previous formula for lateral area when the cylinder is a right circular cylinder.
The Southern Cone (Spanish: Cono Sur, Portuguese: Cone Sul) is a geographical and cultural subregion composed of the southernmost areas of South America, mostly south of the Tropic of Capricorn. Traditionally, it covers Argentina, Chile, and Uruguay, bounded on the west by the Pacific Ocean and on the east by the Atlantic Ocean.
The Cono Sur or Lima Sur (South Lima in english) is one of the five areas that make up the Lima Metropolitan Area. It is located in the southern part of the metropolis hence its name. This socioeconomic levels of this district are varied. Most of the population however belongs to the lower and middle classes.