How many places do you want it figured to? 3.14159 is a fairly common answer, but the value of pi is infinite.
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The count or number of something. E.g.;If x = 2 then the numerical value of 3x is 6.The numerical value of the constant pi is 3.142...
3.14
i think you do d x pi
d * pi or 2 * r * pi Where d is diameter and r is radius and pi = 3.14159
Use the formula for the particular figure