Divide the area by pi (= 3.14159 approx) to get diameter.
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pi is a constant = 3.141592654 . . . . circle area = pi * ( ( diameter/2 )2 )
Diameter x Thickness
Using the Circumference And Area.
First calculate the radius (1/2 of the diameter), then use the formula area = pi x r2.
Use the diameter and divide it by two.