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The answer depends on what te figure is and what you know - or can deduce - about other aspects of the figure. That information will determine whether or not there is a solution and what formula you may be able to use. However, since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.

Q: How do you find the unknown height or diameter of the figure?

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You cannot find the height and diameter of a cylinder by knowing the volume only. There are infinite combinations of height and diameter that will result in the same volume. You need to know either the diameter or the height in addition to the volume to calculate the remaining unknown. Volume = pi/4 * d2 * h (note: pi/4 * d2 is the same as pi * r2)

Diameter is twice the radius. Diameter=2.2

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

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Divide

You cannot find the height and diameter of a cylinder by knowing the volume only. There are infinite combinations of height and diameter that will result in the same volume. You need to know either the diameter or the height in addition to the volume to calculate the remaining unknown. Volume = pi/4 * d2 * h (note: pi/4 * d2 is the same as pi * r2)

Diameter is twice the radius. Diameter=2.2

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

Multiply the diameter by pi (approximately 3.1416) to find the circumference.

height has to be given. or volume. volume of a cylinder is v = (pi r ^2) h or diameter times height.

divide volume by height then by pi.

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.

Your diameter is double the radius. So the diameter is 6

diameter=9 height=11

first you multiply each side by 1,000,000 then you find the surface area of a cylinder that has a diameter of 3in and the height of 6in