Pie or 3.14 times the radius squared. Half of 9 is 4.5, that is your radius. Now 4.5 squared is 20.25. Take 20.25 and multiply 3.14 which = 63.585 or orund the answer up to 63.86
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The area of a 3-inch diameter circle is about 7.068 square inches.
19.63 square inches are in the area of a 5-inch diameter circle.
The area of a 26-inch diameter circle is 530.93 square inches.
A circle with a diameter of 198 inches has an area of 30,790.75 square inches.
490.9 square inches for a 25-inch diameter circle.