Pi and the radius can be used to find the area (PiR^2) or the circumference (2RPi) of a circle, where R is the radius.
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Circumference of a circle is 2 x Pi x the radius
If the figure is truly a circle, then the circumference is (Radius) x (2 pi) .
area = pi*r2 where pi is the irrational number approximated by 3.14159
The area of a circle is defined by the equation A = πr^2 where π = pi (3.14...) A = Area r^2 = radius squared So, the radius of a circle squared multiplied by pi equals the area.
The area of a circle is pi times the square of the radius. Pi has no relationship with the area of a polygon.