What you need is the area of the circle. Area = Pi x r squared where r is the radius.
The radius is one-half the diameter so in this case r=15 to square it, multiply it by itself ( 15 x 15 ) so r squared =225 now multiply that by 3.14 . Ans: 706.5 square inches.
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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.
19.63 square inches are in the area of a 5-inch diameter circle.
A circle with a 23 inch diameter has am area of 415.4756 sq inches (to 4 dp).
20xπ=~62.83185307179586476925286766559