A circle with a radius of 3 inches has an area of 28.27 square inches.
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3 inches, perhaps!
A cylinder with a radius of 7in and a length of 3in has a total surface area of about 439.82 square inches.
The area of a circle of radius 21 is 1386
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared