3 inches, perhaps!
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A circle with a radius of 3 inches has an area of 28.27 square inches.
Circumference: 2*pi*3 = 6*pi inches
A cylinder with a radius of 7in and a length of 3in has a total surface area of about 439.82 square inches.
the radius of a circle is r
The radius of a circle is half the circle's diameter