The formula for finding the Area (square inches) of a circle is A = Pi x R-squared where Pi is 3.1416 and R is the Radius. Radius is one-half of the Diameter, so one-half of 12 is 6. Now, using the formula, do the math: A = 3.1416 x (6 x 6) = 3.1416 x 36 = 113.0976 square inches.
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A circle with a diameter of 12 inches has an area of ~113.1 square inches.
The area of a circle that has a 12-inch diameter is: 113.1 square inches.
About 113.1 square inches.
Twelve inches is a length. It can be a diameter, but if it is a diameter, you would simply say 'The circle is 12 inches diameter'. So; how big is it - it is 12 inches.
Frisbees come in different sizes. The diameter can be 8 inches, 10 inches, 12 inches, or another diameter.