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In Geometry

A circle is the set of all the points that are the same (arbitrary)distance (called the radius) from some (arbitrary) point (calledthe center).

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In Men's Health

Circles are a never ending object. They have no starting and no ending point. They have a center point and from the center to the edge of the circle is the same distance aroun…d the whole object. (MORE)

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Each point on the perimeter is equidistant from the centre. and because it is. what type of question is that anyways?

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No. The only line of latitude that is a great circle is the equator. Incidentally, any pair of longitude lines 180 degrees apart from each other would form a great circle.

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No..
Any great circle on the earth has a circumference of about 24,000 miles..
The circumference of the Arctic Circle (and the Antarctic circle too) is about 9,945 miles..
…Imagine circles around the North Pole. The closer to the pole the circle is, the smaller it is. If you were right there at the North Pole, you could walk a 10-foot circle around it. The Arctic Circle is a circle around the pole, but about 1,570 miles south of it..
The only circle around the pole that's a great circle is the Equator. (MORE)

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An annulus. Area = pi (R 2 - r 2 ) when R is radius of larger circle and r is radius of smaller circle.

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it is called circle because it is circular. circular means smooth, rounded edges. a circle matches that description.

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In Science

A radius of 'x' units. A diameter of '2x' units. A circumference of '2(pi)x' units. An area of '(pi)x 2' units, where x is a positive real number.

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In Geometry

it is a round shape that you should know before going to nursery soyou should know

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In Geometry

A circle is the set of all points in two dimensional space that are at the same distance from some fixed point.