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Find the diameter of the circle, which is the length from one side of the circle to the other (in the exact centre, of course.) Multiply this number by Pi, which is a number somewhere between 3 and 4 (it starts out as 3.141, but the decimals go on infinitely.) The circumference of the circle is then - assuming the diameter is 2 - 6.282, because that is the answer to 2 x π (π represents Pi.)

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15y ago

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