20xπ=~62.83185307179586476925286766559
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Diameter = 14 inches => circumference = pi*14 = 43.98 inches.
The area of a 3-inch diameter circle is about 7.068 square inches.
A circle with an 8-inch diameter has a perimeter of 25.1 inches.
19.63 square inches are in the area of a 5-inch diameter circle.
A circle with a 23 inch diameter has am area of 415.4756 sq inches (to 4 dp).