To uninstall triangle-bin just follow these instructions.
/debian/wheezy/non-free///install/index.html High-quality 2-D mesh generator binary programs Debian 7.0 non-free/science 1.6-2
sudo apt-get remove triangle-bin
Which will remove just the triangle-bin package itself.
sudo apt-get remove --auto-remove triangle-bin
This will remove the triangle-bin package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for triangle-bin then this will work.
sudo apt-get purge triangle-bin
Or similarly, like this triangle-bin
sudo apt-get purge --auto-remove triangle-bin
|Maintainer||Adam C. Powell, IV
|Description||High-quality 2-D mesh generator binary programs|