Area = circumference squared...
You do circumference divided by 4,...
and then divide that by Pi.
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12.732 (rounded)
The circumference is: 32.1
The area of a circle of radius r is pi*r*r
Divide the circumference by pi, and that will give you the diameter. Then take half of the diameter (the radius), and plug it into the formula for the area of a circle (A=πr²)
If the area of a circle is given as 67cm squared, the diameter is 9.236 cm and the circumference is 29.02 cm