Circles, disc and annulus
(重定向自Circles)
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.
参看分类:Circles.
Filled
[编辑]English: This shape, the interior of a circle, is called a disc.
Outlined
[编辑]Annulus
[编辑]
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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