Set pagemargins and linedistance

Question

I'm using a template for this document and I want to set the margins to 2.5cm on each side. The top of my .tex file looks like this:

% $Id: $
\pdfpxdimen=1in

\divide\pdfpxdimen by 150

\documentclass[a4paper,12pt]{report}

How can I set the margins to 2.5cm?

And another question: is it possible to have a different line-distance for the abstract part, and how?

Answer 1

Use the geometry package and the setspace package.

\documentclass{article}
\usepackage[a4paper,margin=2.5cm]{geometry}
\usepackage{setspace}
\begin{document}
\begin{abstract}
\doublespacing
The quick brown fox jumps over the lazy dog.
The quick brown fox jumps over the lazy dog.
The quick brown fox jumps over the lazy dog.
\end{abstract}
The quick brown fox jumps over the lazy dog.
The quick brown fox jumps over the lazy dog.
The quick brown fox jumps over the lazy dog.
\end{document}