Take the diameter of the circle times 3.14159 (which is PI).
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Area of a circle measured in square units = pi*radius2
The formula for calculating the area of a circle - is Pi x r x r... where r is the radius.
Area of any circle is: pi*radius*radius or pi*r^2
4 * pi * r * r15 Fby subcooling20The formula for calculating the area of a circle - is Pi x r x r
Nobody ever has because the true value of pi has never been worked out and we only use an approximation of pi when calculating the area of a circle.