2(pi)r
(pi)r^2
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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.
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
Square root (Area/pi) to get the radius Then 2xRadiusxPi= Circumference