Whatever it is, all three numbers are the same.
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height*length*width = volume Divide both sides by length*width to find the height: height = volume divided by length*width
If it is a true cube, then the length = width = height. Therefore the length = cube root of 81 = 811/3 = 4.3267....inches.
volume = length*height*width Rearrange the formula: length = volume/height*width
The formula for volume is length x width x height = volume. So if you take the volume and divide it by the length and width it should give you the height.
Let the length be 3x, the height be 2x and the width be x: length*height*width = volume 3x*2x*x = 2058 cubic cm 6x3 = 2058 Divide both sides by 6: x3 = 343 Cube root both sides: x = 7 cm Check: 21*14*7 = 2058