displacement
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you multiply length x width x height or pour water into container and measure the height, put object in water and measure the water level subtract the water level before and after and that will be your volume
Volume=(pi)(radius^2)(height)
The volume of a rectangle is 0. It is a 2-dimensional object and so has no volume.
V = pi*r^2*L.
circumference is the perimeter of a circle. a circle is 2 dimensional. volume is 3 dimensional. you need to state what shape it is. I could guess that you are talking about a cylinder. the volume is pi.r2.h, if you find the radius from the volume, you can find the perimeter of the circle by 2.pi.r