A 4.75-inch diameter circle contains 17.72 square inches.
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A 1.25-inch diameter circle contains 1.227 square inches.
A 20-inch diameter circle contains: 314.16 square inches.
The area of 3.5-inch diameter circle is: 9.621 square inches.
The area of a 18-inch diameter circle is: 254.5 square inches.
The area of a circle that has a 12-inch diameter is: 113.1 square inches.