A 4-inch diameter circle has an area of 12.566 square inches.
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A 32-inch circle has an area of 804 square inches.
The area of an 11-inch diameter circle is: 95.03 square inches.
Area of a 12-inch circle: 113.1 square inches.Area of a 16-inch circle: 201.1 square inches.
The area of a circle that has an 8.5 inch diameter is: 56.75 square inches.
The circumference of a circle is given by Circumference = pi x diameter. The area of a circle is given by Area = pi/4 x diameter2. Thus for a circle with circumference c = 12 in. The area will equal a = 11.459 in2.