Frisbees come in different sizes. The diameter can be 8 inches, 10 inches, 12 inches, or another diameter.
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The circumference of a circle with a diameter of 12 is about: 37.7 (C = diameter x Pi).
diameter = circumference/pi = 12/pi 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.
diameter = circumference/pi = 12/3.1416 units = 3.62 units (approx)
The circumference of a circle with a diameter of 12 cm is: about 37.7 cm