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That depends on what the question is. If you want the area of a rectangle, you simply multiply length x width. But with a rectangular box, to know the volume for example, you need three numbers (length, width, height).

Q: What is the answer to a rectangular box that the length is 7.11 and the width is 3.7?

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Subtract the square of the width from the diameter. The square root of that is the length.

Length = Volume divided by (Width X Heigth)

area of an box is length x width.

length x width x height easy

You need the total volume as well, then divide that successively by width and length

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Multiply length x width.

Subtract the square of the width from the diameter. The square root of that is the length.

Length = Volume divided by (Width X Heigth)

area of an box is length x width.

Volume = Length * Width * Height.

length x width x height easy

you multiply the length times width times height.

8000

You need the total volume as well, then divide that successively by width and length

A rectangle has only two dimensions, for example, length and width. If you multiply that, you get the area. A rectangular box has a length, width, and height. If you multiply all three, you get the volume.

The volume of a rectangular prism (a shape like box)

You can't, unless it's a cube.