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A circle has no "sides".

The "perimeter" of a circle is usually referred to as the circle's "circumference", i.e. the distance around it.

The circumference of a circle is [ 2 pi R ], where 'R' is the distance from the center of the circle to its curve.

If the circumference of a circle is 12, then 12 = [ 2 pi R ]. R = [ 12 / 2 pi ] = [ 6/pi ].


The area of a circle is [ pi R2 ].

If R = 6/pi, then the area is [ pi R2 ] = [ pi x (6/pi)2 ] = [ pi x 36 / pi2 ] = ( 36/pi ) = 11.459 square centimeters (rounded).
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