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What is the circumference of d=2.1cm using 22/7

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If you think on circumference of a circle.

C = d * pi

pi = 22 / 7

C = d * pi

C = 2.1 * ( 22 / 7 ) = 2.1 * 22 / 7 = 46.2 / 7 = 6.6

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