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##  Class files

The page dimensions in a LaTeX document are highly configurable and the geometry package offers a simple way to change the length and layout of different elements such as the paper size, margins, footnote, header, orientation, etc.

# Introduction

Suppose you have to create a document in a4paper and the text shouldn't exceed 6 in width and 8 in height. To create it with geometry is easy, include this one line in the preamble:

`\usepackage[a4paper, total={6in, 8in}]{geometry}`

The parameters passed to the command determine the layout. In this case a4paper establishes the paper size and the total parameter determines the size of the text area.

# Paper size, orientation and margins

Paper size, orientation and margins are the most common page elements that must be changed depending on the type of document. To set the desired values there are two ways, either you pass them as parameters to the `\includepackage` statement as in the example above, or use a `\geometry` command in the preamble.

For example, let's create a document with legal paper size, landscape orientation and a 2 in margin:

`\usepackage[letterpaper, landscape, margin=2in]{geometry}`

Also, you can achieve the same in a slightly different way

```\usepackage{geometry}
\geometry{legalpaper, landscape, margin=2in}```

As you see, the parameters are comma separated. For a complete list of predefined paper sizes see the reference guide. The second parameter is the orientation, its default value is portrait. Finally, each margin is set to 2 in.

# Fine tuning your LaTeX page dimensions

The regular LaTeX page dimensions are presented (with example values) in picture at the right of this section.

The geometry package provides a flexible and easy interface to change page dimensions. You can change the page layout with intuitive parameters:

Next is a list of document elements whose length can be changed. The parameters have to be written in the form `parameter=value`, use standard LaTeX units. (mm, cm, pt, in)

`textwidth`
Corresponds to element 8 in the figure.
`textheight`
Element 7 in the figure.
`total`
Depends on other parameters, by default defines the dimensions of the Body, but can be combined with the `includehead`, `includefoot`, `includeheadfoot` and `includemp` commands to change the dimensions of Header, the Body, the Footer and the Margin Notes altogether.
`left`, `lmargin`, `inner`
These three parameters change the length of the left margin. Elements 1 and 3 in the figure, combined.
`right`, `rmargin`, `outer`
These three parameters change the length of the right margin. Elements 9 and 10 in the figure, combined.
`top`, `tmargin`
These two parameters represent elements 2 and 6 in the figure, combined.
`bottom`, `bmargin`
These two parameters set the distance from the bottom edge of the document to its baseline.
`headheight`
`footsep`
Separation between the bottom of the text (baseline) and the top of the footnote. Element 11 in the figure.
`footskip`
Distance between the baseline of the text and the baseline of the footnote.
`marginparwidth`, `marginpar`
Width of the margin notes. Element 10 in the figure.

The paper size can be set to any size you need by means of the command `papersize={⟨width⟩,⟨height⟩}`.

Let's see an example with some of the aforementioned options:

```\usepackage{geometry}
\geometry{
a4paper,
total={170mm,257mm},
left=20mm,
top=20mm,
}```

Here the text area, the left margin and the top margin are set. The right and bottom margins are automatically computed to fit the page.

#  Reference guide

 parameter description values papersize Determines the size of the paper a0paper, a1paper, a2paper, a3paper, a4paper, a5paper, a6paper, b0paper, b1paper, b2paper, b3paper, b4paper, b5paper, b6paper, c0paper, c1paper, c2paper, c3paper, c4paper, c5paper, c6paper, b0j, b1j, b2j, b3j, b4j, b5j, b6j, ansiapaper, ansibpaper, ansicpaper, ansidpaper, ansiepaper, letterpaper, executivepaper, legalpaper