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A circle bounds a region of the plane called a disc. The circle has been known since before the beginning of recorded history. Natural circles are common, such as the full moon or a slice of round fruit. The circle is the basis for the wheel, which, with related inventions such as gears, makes much of modern
A beam compass and a regular compass Using a compass A compass with an extension accessory for larger circles A bow compass capable of drawing the smallest possible circles. A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs.
Circle, Alaska, United States; Circle, Montana, United States; Circle Interchange, Chicago; Circle, an alternative name for an administrative sub-district in India; see Tehsils of India
Henges sometimes, but by no means always, featured stone or timber circles, and circle henge is sometimes used to describe these structures. The three largest stone circles in Britain ( Avebury , the Great Circle at Stanton Drew stone circles , and the Ring of Brodgar ) are each within a henge.
This list of circle topics includes things related to the geometric shape, either abstractly, as in idealizations studied by geometers, or concretely in physical ...
For more information, see the article about circle. Articles relating to circles , a shape consisting of all points in a plane that are at a given distance from a given point, the centre . Equivalently, it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant .
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.
The region of the plane between two concentric circles is an annulus, and analogously the region of space between two concentric spheres is a spherical shell. [6] For a given point c in the plane, the set of all circles having c as their center forms a pencil of circles. Each two circles in the pencil are concentric, and have different radii.