#!/usr/bin/perl
# Copyright 2002-2012, Paul Johnson (paul@pjcj.net)
# This software is free. It is licensed under the same terms as Perl itself.
# The latest version of this software should be available from my homepage:
# http://www.pjcj.net
my $pi = 3.14159; my $r = 4;
my $c = 2 * $pi * $r;
my $a = $pi * $r * $r;