The square has sides of 3*sqrt(2) = 4.2426 feet.
[Assuming 12 ft circle refers to its diameter.]
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Area of circle: pi*6 squared = 36*pi square inches
The area of a circle with a diameter of 12 inches is: 113.1 square inches.
The area of a 12-meter circle is 113.1 square meters.
None. A 12 foot diameter is the length across a circle: it is a linear distance, not an area.
452.39 square units.