pi * (radius * radius)
if the diameter is 5 inches
3.14*(2.5*2.5)
3.14 * 6.25
19.625 inches
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A 12-inch circle has an area of about 113.1 square inches.
= 6.14 Area of Circle - Area of Square r x Pi - side x side
A 10-inch circle has an area of 78.54 inches2
Assuming that "1 inch round circle" refers to a circle whose circumference is 1 inch, its area is 51.34 sq mm.
A 48-inch diameter circle has an area of: 12.57 square feet.