Stand it on a circular end, like a tin can standing on a shelf.
Its volume is the area of its circular base, multiplied by its height.
Another Answser:
To answer the specific question, you can not find the volume of a cylinder when given only its diameter. You need also its length.
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The diameter, alone, is not enough to find the volume of a cylinder. You need the height as well. > Where pi = 3.1416, and d = cylinder diameter cylinder volume = pi * (d/2)2 * length of cylinder
Easy, you find the area of the circle (Pi X Radius squared) and then multiply it by the height. Your question asks about using the diameter...the radius is half of the diameter.
You cannot determine the height and diameter from just the volume because there is an almost infinite number of combinations of height and diameter that could create a particular volume.
Volume of a cylinder in cubic units = piradius2height
Density = Mass/Volume, correct. However, with a cylinder, you have to find the volume. In order to find the volume of a cylinder use the equation PiR2 * H where "R" is the radius (Diameter/2) squared.