3.14.....if you round it up...this is actually standard...pi actually goes on forever, but this is the standard number for pi.
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circumference = 2 x pi x radius which is the same as pi x diameter so the answer is pi.
There have been many estimations of Pi by many scientists over the years. To answser this questions, more information is needed. You might also see the link on the history of Pi.
None. There is no problem!
Pi cannot be expressed exactly as any fraction (including as a fraction of powers of 10, which is what a decimal fraction is). There are an infinite number of place values in the number 'pi'.
A 24-foot circle has a circumference of 24' x Pi or 75.36 feet, using 3.14 for Pi.