The area of a circle with radius r is pi*r*r where pi = 3.1416 approx.
When r = 6 cm, the area is 113.1 sq cm.
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A circle with a radius of 21 cm has an area of ~1,385.44 square cm
Using 3.14 as Pi the area of circle is: 32.153600000000004
Area of a circle in square cm = pi*radius squared
A circle with a radius of 19 cm has an area of 1,134.11 square cm.
A circle with a radius of 25 cm has an area of 1,963.5 square cm.