That depends on how you look at an object. For example,imagine you have a cube in front of you and you measure the distance from top to bottom of that face of the cube, call the face f, that is the height. Now turn the cube so the face you were viewing is one the bottom. The same measurement you made of f, the height, is now the width.
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1d has only the length, but 2d has both the length and width.
Length*width*heigth I don't get the hollow part. That all depends on whether the cube is closed, and how thick the squares are.
The area is the product of the length of a thing times its width. l x w = A
if the perimeter is 46m, then side + length = 23 so we need two values, when added together are 23, with a difference of 11 6 + 17 = 23, (and have a difference of 11) therefore the length = 17m, width = 6m
perimeter = (2*length) + (2*width) length = 2*width so perimeter = (2*2*width) + 2*width = 6*width perimeter = 48 so you can figure out the width and length