# Lengths

A `length` is a measure of distance. Many LaTeX commands take a length as an argument.

- \newlength: Define a new length.
- \setlength: Set the value of a length.
- \addtolength: Add a quantity to a length.
- \settodepth: Set a length to the depth of something.
- \settoheight: Set a length to the height of something.
- \settowidth: Set a length to the width of something.
- Predefined lengths: Lengths that are, like, predefined.

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