Its a bit ambiguous. As it can mean front to back or top to bottom. But in the case of a cube it doesn't matter as all sides are the same length. So the short answer would be the length of any side.
Its better to think of length, width and height of a 3d object or to use the classical axes notation x, y and z
x = Length - 1 dimension or a straight line
xy = Length x Width - 2 dimensions
xyz = Length x Width x Height - 3 dimensions
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A cube has equal width, depth and height, so in this case the volume would be 2 x 2 x 2 (or 23) = 8 cubic cm (or cm3)
depth is when units are cubed or the volume. or you multiply units three times. So length times the width times the height.. l x w x h=V so lets say a cube is 5 units long/wide/tall. it will be 5 x 5 x 5= 125un3
The area of a cube is given by the formula volume = width × height x depthBut since the width, height and depth are by definition the same in a cube, the formula is usually written as V= s3To determine the length of a side given the volume we just have to reverse the formula:s = 3√volumes = √64cm3 = 4cm
Three dimensional objects would be a sphere, cube, pyramid, cylinder, cones, etc. Anything with a width, height, and depth is three-dimensional.
If by cube you mean perfect cube (a cube of an integer), then no, and the nearest perfect cube is 81.