GNU Info

(latex.info)Lengths

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Lengths
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   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.