Circles, disc and annulus

English: A circle is the set of all points in a plane at a fixed distance, called the radius, from a fixed point, the center.

 Vedi anche la categoria : Circles.

Per geometry of circle (conic section), vedere Category:Circle geometry or Circle (Geometry).

Filled

English: This shape, the interior of a circle, is called a disc.

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Outlined

English: These are circles proper or, if not to neglect the line thickness, these are rings.

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Annulus

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  Circle
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  Circle with a slash through it
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  The Twelve-Mile Circle is an arc of a circle with a twelve-mile radius, with the center of the circle in the center of the town of New Castle, Delaware.
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  Blue circle for diabetes
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  Gloriole