a ball is a sphere not a circle, and a circle is not a polygon because is has no sides.
hope it helps :)
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namefive objects that suggest acircle?
flying saucer, plate, bottle cover, compass, letter O
what differentiates acircle from other plane figures?

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A ball is a sphere. A sphere is a 3d model of a circle.

A circle has a infinitely many sides which is equidistant to a fixed point called a center.
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