The formula for calculating the area of a circle - is Pi x r x r... where r is the radius.
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15.9 cm2
Using 3.14 as Pi the area of circle is: 0
A 3 centimeter diameter circle has an area of 7.068 cm2
If the diameter of a circle 20 cm is tripled the area will increase from 314.2 cm2 to 2,827 cm2
The area is 32.17 cm2