how to set gnome-terminal default size in gnome 3

To set default size for gnome-terminal:

1. run "gconf-editor" command


2. navigate to /desktop/gnome/applications/terminal


3. change "exec" key to "gnome-terminal --geometry=120x30" where 120x30 - your favourite size


4. You can add offset to the window. Example: gnome-terminal --geometry=140x40+60+150

5. enjoy!