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The lateral surface area of a right circular cone is = where is the radius of the circle at the bottom of the cone and is the slant height of the cone. [4] The surface area of the bottom circle of a cone is the same as for any circle, . Thus, the total surface area of a right circular cone can be expressed as each of the following:
Gaussian curve with a two-dimensional domain. Many shapes have metaphorical names, i.e., their names are metaphors: these shapes are named after a most common object that has it.
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If we discard the origin, we can divide all coefficients by their sum to see that a conical combination is a convex combination scaled by a positive factor. In the plane, the conical hull of a circle passing through the origin is the open half-plane defined by the tangent line to the circle at the origin plus the origin.
A (general) conical surface is the unbounded surface formed by the union of all the straight lines that pass through a fixed point — the apex or vertex — and any point of some fixed space curve — the directrix — that does not contain the apex.
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The ripples formed by dropping a small object into still water naturally form an expanding system of concentric circles. [9] Evenly spaced circles on the targets used in target archery [10] or similar sports provide another familiar example of concentric circles.
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