9 times pi sqinches
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19.63 square inches are in the area of a 5-inch diameter circle.
The area of a 3-inch diameter circle is about 7.068 square inches.
A circle with an 8-inch diameter has a perimeter of 25.1 inches.
The area of a circle with an 8 inch diameter is approximately 50.27 square inches.
The diameter of a circle is twice the radius. Since the radius is half the diameter, if you have a circle with a diameter of 4.6 inches, it means the diameter is already 4.6 inches. Thus, the diameter of the circle is 4.6 inches.