In the U.S., letter size paper is 8.5" wide (21.59 cm).
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The answer depends on the piece of paper. You can cut it in half lengthways: it will still be a piece of paper but its width will be half as large!
The height of a normal letter-size paper (also known as US Letter) is 11 inches, while the width is 8.5 inches.
A piece of paper has a length and a width. Though extremely small, the paper has a thickness, giving the paper 3D.
29.7cm by 21cm
A piece of paper has three dimensions. They are the length, width and thickness of the paper. Paper is available in many sizes such as A1, A3, A4 and A5.