Lets see
21x12.7=266.7
266.7/30=8.89
so answer is 8.89 inches
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The approximate diameter of a circle whose circumference is 21cm is: 6.68cm
55cm x 40cm x 20cm = 21.65 inches x 15.75 inches x 7.87 inches.
80mm x 120mm equates to 3.15 inches x 4.72 inches.
24 x 36 = 864 sq inches
16.54 x 4.724 x 12.6 inches