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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.

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Q: What is pi in centimeters?
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C = pi D = 10 pi = 31.416 centimeters (rounded)


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