Formula of a circle in a Cartesian plane:
(x-h)^2+ (y-k)^2 = r^2 where the center is at (h,k) and the radius is r.
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The formula for the area of a circle is pi times the radius squared. The formula for the circumference of a circle is two times pi times the radius.
In order to convert the area of a circle to the circumference of the circle, divide by the radius and multiply by two. The formula for the circumference of a circle is pi times the diameter.
Area of a circle = pi*radius2
same as for a whole circle
There is a constant relationship between the radius of a circle and its circumference. This is expressed in a formula.