Area of a circle = pi*radius2
Circumference of a circle = 2*pi*radius or diameter*pi
Diameter of a circle = 2*radius
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The area of a circle with a known radius can calculated using the following formula where r is the radius : A = Pi(r)2
If a circle has the area A and radius r, thenA = pi * r^2
-- Take the formula for the area of the circle in terms of the radius . . . A = (pi) R2-- Solve that formula for 'R'. You'll then have a formula for the radius in terms of the area,which is exactly what you're looking for.
The formula is: Area = Pi(r)2
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.