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Pi is 3.14, a number that represents the ratio between a circle's circumference and its diameter. It cannot be used to find the height of an elephant.
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.
Volume = Pir2 X height Diameter = 2r Pi = 3.1416 Solve for diameter Volume/height = 3.1416(diameter/2)2 (square root of (Volume/height/3.1416)) X 2 = diameter of the cylinder base
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.
For any circle in a plane, the ratio of circumference to diameter is a number called pi, approximately 3.14.