Assuming that 12" round means a circle with a circumference of 12", its radius would be 12/(2*pi) = 6/pi inches.
Its area would, therefore, be pi*(6/pi)2 = 36/pi sq inches.
In terms of sq mm, that is 7393 sq mm (to 4 sig figs).
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There are 100*pi square inches in a 20 inch diameter circle
The area of a circle with an 8 inch diameter is approximately 50.27 square inches.
490.9 square inches for a 25-inch diameter circle.
Area of circle is pi*radius*radius. hence area of 1.5 inch circle is 7.065 square inches.
The area of a 3-inch diameter circle is about 7.068 square inches.