Providing that its diameter is 12 cm then:-
circumference = pi*12 = 37.699 cm to 3 decimal places
area = pi*6 squared = 113.097 square cm to 3 decimal places
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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).
Circumference: 12*pi = 37.699 cm rounded to three decimal places
The area is ~452.3 cm2
Using 3.14 as Pi the area of circle is: 113.03999999999999
If the circumference of a circle is 6.28 then its area is about 3.138 square units