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Pi is unitless as far as I am aware. however pi = 3.1415926 as far as I remember, but 3.14 in most cases is all that's necessary. Only when you multiply by centimetres squared (r2) for example does the answer get units of cm2.
The circumference is found by doubling the radius, and multiplying that number by the value of PI. The formula is Pi x 2rThe area is found by squaring the radius, then multiplying that number by the value of Pi. The formula is Pi x r2 The letter r in both cases represents the radius.
[pi^(1/3)]^2 * pi = pi^(2/3) * pi = pi^(5/3) The answer is the cubic root of pi to the fifth power.
(pi + pi + pi) = 3 pi = roughly 9.4248 (rounded) Well, if you use the common shortened version of pi which is 3.14 and add that 3 times, you get 9.42.
You can find lots of digits of pi online, in different places. But really, there is no practical use for any of those; having the value displayed on your scientific calculator - with 10 or 12 significant digits - or on the computer with 15 significant digits is more than enough for any calculation where you need pi.