Divide the diameter by 2, to get the radius. Then use the formula for the area of a circle:area = pi x radius squared
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A 16-inch circle has an area of 201.06 square inches.
The area of a circle with a diameter of 16 inches is: 201.1 square inches.
Area of any circle is: pi times radius squared
4.
A 16-foot circle has an area of 201.06 square feet.