It is: 3.142 to 3 decimal places
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3.14159265
It can be.
3.14159264
With pi rounded to 8 digits, it is 24.000008.
C = 2 pi (r) (two times pi times the radius of the circle) OR C = pi (d) (pi times the diameter of the circle). Often, pi is rounded off to equal 3.14, so if your calculator does not have a pi button on it, then use 3.14.