There are: pi*1*1 = pi square inches
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3.1415926535897932384626433832795028841971693993751..square inches
256*pi square inches Area of a circle = pi*radius2
Area = 0.785 square inches.
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.
The circumference of a six-inch diameter circle is: 18.8 inches.