Well, You don't understand me. I'll try to make you easy to understand what I meaned.
First picture: I meaned this question mark.
http://img122.imageshack.us/my.php?image=sh3img13gz.jpg
Second picture: And when select question mark then pick up tool you want. Ruler,protractor or compass.
http://img122.imageshack.us/my.php?image=sh3img20cv.jpg
In this picture I pick up the ruler. For this you must have a game patched to 1.3 or I suggest the last 1.4b.