Divide the area by pi. Find the square root of your result. Multiply this by 2. Now multiply this by pi. There is your circumference.
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A = pi*r^2, C = 2*pi*r. Since you know circumference, r = C/2/pi, so A = pi*(C/2/pi)^2 = C2 / (4*pi)
you divide the surface area by the circumference.
To find the area of a circle knowing only the circumference, you can use the formula A = (C^2) / (4π), where A is the area and C is the circumference. Square the circumference, then divide it by 4π to get the area.
Square root (Area/pi) to get the radius Then 2xRadiusxPi= Circumference
If the object is a circle and if 9.5 is the diameter, the area is 70.88 and the circumference is 29.85
If the object is a circle and if 24 is the diameter, the area is 452.39 and the circumference is 75.4