If 27 inches is the diameter, then that is the diameter. If 27 inches refers to the radius, you must multiply it by 2 to get the diameter.
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There are 100*pi square inches in a 20 inch diameter circle
The radius of a circle is half the diameter, so the radius of a 6 inch diameter circle is 3 in.
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.