3.14159
this is how far i know it.
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Pi = 3.14159.....I don't know the rest of the digit's.
i dont freaking know
it is impossible to know because no one has been able to find the last digit of pi yet 5 times pi is 15.708 to 3 decimal places.
The answer is Pi times radius squared. Although you can't know anymore since you don't give what the radius is. Although, Pi can be simply referred to as 3.14
Divide the circumference by pi (pi = 3.14159 or rounded to 3.14 for rough approximation) to find the diameter of a circle.