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OpenStudy (anonymous):
why do we sometimes use 2pi instead of pi when doing volumes revolution?
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OpenStudy (anonymous):
in converting radians to degree, the conversion factor is 180/pi. Hence, in a complete revolution which is 360, there is 2pi. I hope that answers your question. 360 (pi/180) =2pi
OpenStudy (anonymous):
not really ....when doing maths .specificaly calculus in volumes of revolution on the shell's method we use 2pi but on the diskwashers method we use pi
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