3.14 square cm
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The radius will stay as 1cm but the area of a circle is: pi times radius squared
2cm; the diameter of a circle is twice its radius.
The area of a circle is calculated from the formula Pi x r2 . A 1cm diameter circle has a radius of 0.5cm, thus it has an area of 0.785cm2
The area of a circle of radius 21 is 1386
The area of a circle with a radius of 14.4 is 651.4