A = pi r^(2)
Where
A is the Area of the circle
pi = 3.141592....
r = radius
r^(2) = radius squared. That is 'r X r'.
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The formula to find the area of a circle is pi x the radius squared.
The formula to find area is you do the radius squared times pi or 3.14
By using the formula: area of circle = pi*radius2
The area of a circle = Pi*r2 where r is the radius and Pi is approximately equal to 3.14.
There is none because a circle has no volume but the area of a circle is pi*radius^2