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The area of a circle with a diameter of 12 inches is: 113.1 square inches.
A = ~113.0973 units2
Diameter = 12 cm so radius = 6 cm. Then area = pi*r2 = 36*pi = 113.1 cm2
12
None. A 12 foot diameter is the length across a circle: it is a linear distance, not an area.