ページレイアウト、余白、用紙サイズ

\documentclass[a4paper,11pt,twocolumn]{article}
\title{Two Columns on A4}
\author{Erika Mustermann}
\date{}
\begin{document}
\maketitle
\section{Introduction}
This document is set on A4 paper at 11 points in two columns.
The text fills the left column first and then continues in the
right one. Each column is a little less than half the text width.
\section{Method}
We measured 44 samples and wrote down every value.
\end{document}

\documentclass{article}
\usepackage[a5paper,landscape,margin=1.5cm]{geometry}
\begin{document}
\section*{A wide page}
This page is A5 turned on its side, with margins of 1.5 cm all
round. Erika Mustermann uses it for handouts that lie next to a
keyboard. Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
Ut purus elit, vestibulum ut, placerat ac, adipiscing vitae, felis.
\end{document}

\documentclass{article}
\usepackage[paperwidth=220mm,paperheight=110mm,margin=12mm]{geometry}
\pagestyle{empty}
\begin{document}
Erika Mustermann, Musterstraße 44, 12345 Musterstadt

\begin{flushright}
Hans Mustermann\\
Beispielweg 44\\
54321 Beispielstadt
\end{flushright}
\end{document}

\documentclass[a5paper]{article}
\usepackage[margin=1cm]{geometry}
\begin{document}
This page asks for 1 cm margins on A5 paper, and gets them: the text
runs almost to the edge of the paper, as it does in a TeX
installation. Lorem ipsum dolor sit amet, consectetuer adipiscing
elit. Ut purus elit, vestibulum ut, placerat ac, adipiscing vitae,
felis. Curabitur dictum gravida mauris.
\end{document}

\documentclass{article}
\usepackage{setspace}
\onehalfspacing
\setlength{\parindent}{0pt}
\begin{document}
The first paragraph is set with the normal line spacing,
although the preamble asks for one and a half.

The second paragraph still starts with an indent, although
the preamble sets the indent to zero.
\end{document}