Answered

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

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John50viz
3.14285714285 this is the answer
Goldanunezviz
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