pi * r squared is the formula; so 3.14 * 2 * 2 = 12.56
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The circumference of a 4 foot circle is: 12.57 feet(diameter x pi = circumference).
The area of a circle (in square hectometers) if the diameter is 4 cm is: 0.001257 hectometers2
How many cubic yards in an 12 foot diameter circle with a 4 inch thickness?
Area = pi*d2/4 = 4418 sq feet approx.
12.56