what is invention of the radi circle perimeter
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plus some of all the sides
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in geometry, the circumferences (from latin circumferens, meaning "carrying around") of a circle is a (linear) distance around it. that is, the circumference would be the length of the circle if it were open out and straightened out to a line segment. since a circle is the edge (boundary) of a disk, circumference is a special case of perimeter. the perimeter is the length around any closed figure and is the term used for most figures accepting the circle and some circular-like figures such as ellipses. informally, "circumference" may also refer to the the edge itself rather than to the length of the edge.
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