Circumference of disc: 9*pi = 28.274 inches to three decimal places
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It is 9 inches wide.
9 inches x 9 inches = 81 one inch servings
It is: 9*4.5*3 = 121.5 cubic inches
It is: 9*pi which is about 28.274 inches
all you have to do is put 1 inch over 9 feet. Example : 1/9