The area of a circle is pi x radius2. You know the radius already since it's diameter/2 which is 8 inches. Your answer then is pi times 8 inches squared which is 64 times pi inches squared. pi is about 3.1415 so multiply that by 64 if you need to resolve the pi.
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15.7
A circle with a 14 inch diameter has an area of 153.9 sq inches.
12.5664 Sq.In.
113 1/7
12 inches is the diamter so 6 inches is the radius. The area is 36Pi or about36x3.14 which is about 113 square inches