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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C = pi D = 10 pi = 31.416 centimeters (rounded)
Area = pi R2 = 484 pi = 1520.53 square centimeters = 1.52 square meters
circumference = 2*pi*3.4 or pi*6.8
volume of a cylinder = pi*radius2*height rearrange the formula to make the height the subject of the formula: height = volume/(pi*radius2) height = 48/(pi*22) = 3.819718634 centimeters
Since Pi is equal to the circumference over diameter, the diameter of a circle is equal to its circumference over Pi. So divide 24 centimeters by 3.14159 to get approximately 7.63943 centimeters.