Originally Posted by
HermanMelville
I am not sure of what the hanger consists, to be foolishly honest. It seems to me, however, that the derailleur is bent, i.e. the top part that the chain is wrapped around.
The hanger is the part the RD bolts on to, have a look at the Park Tool how to site
http://www.parktool.com/blog/repair-help to get an idea of what is what on a bike.