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circumference is the distance around the circle, so it sounds as though you are stating the circumference in your original question; 66 inches.

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Q: What is the circumference of a 66 inch round circle?
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What is the circumference of a 21-inch circle?

The circumference of a 21-inch circle is: 66 inches.(C = d x Pi).


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By a 21-inch circle I presume you mean that the diameter is 21 inches. So the radius is half as long, 10.5 inches. The formula for the circumference of a circle is 2 pi r, where r is the radius. Pi is about 3.14. That is accurate to 2 decimals, or 3 significant digits all together. I use that approximation because the dimension we are given has 2 significant digits. So the circumference is pi times the diameter; we multiply 3.14 by 21 inches and get 65.94. To 2 significant digits, that is 66 inches. If you meant that the radius was 21 inches, then the circumference would be twice as much, or 132 inches.


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