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In three dimensional object how do you know which is the length and which is the width?

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It might make a difference if you're going to use the object to complement the decor of
your living room.

But if all you're going to do is calculate the area of the base or the volume of the whole object,
it doesn't make any difference.
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Length is usually left to right, and the side that is not the height or length is the width.
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Is 'one-dimensional' length or width?

One dimensional is a line between two points with a length. Two dimensional is a form like a circle or square with a length and width. Three dimensional is a form like a s

Three dimensional object which has one base with sides of the same length?

The base of a tetrahedron has 3 that are of equal length; essentially, it's made up of four equilateral triangles (hence the 'tetra'). A pyramid base has 4 sides of the same l