Question 1031743
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how do you find an exact circumference of a circle?
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Circumference  "C"  of the circle is


C = {{{2*pi*R}}},


where  R  is the circle's radius,  or  (which is the same)


C = {{{pi*D}}},


where  D  is the circle's diameter.


Here  {{{pi}}}  is well known constant  pi = 3.14159265 . . . ,  which is irrational number.