If the circle has a diameter of 8 inches, it's 50.265 square inches. If the circle has a radius of 8 inches, it's 201.06193 square inches. In the odd case that the circle has a circumference of 8 inches, it's 5.09296 square inches.
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The circumference of an 8-inch circle is: 25.1 inches.
A 12-inch circle has an area of about 113.1 square inches.
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.