Length x width gives you the area of something. A room for instance. You might have to do this if you were buying a carpet for that room and needed to know what size carpet.
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Base times height tims width equal to length
volume The 'Volume' of an object or space
15 feet.
The length is 20 cm.
We know that every side of a square in the same length, and that the area is equal to the width times the height. Because this is a square, the width and height are equal, so area is equal to the length of one of the sides times itself, or the length of one of the sides squared. So, in order to find the length of one of the sides, you take the square root of the area. The length of the side is equal to both the width and the height. For example, if you have a square with an area of 9, take the square root of 9, which is 3. So the width of that square is 3.