Not to complete rip-off what this guy said about the eyeballing game, but here is the idea … we’ve all looked at something and tried to eyeball it without really breaking out the ruler or protractor.
To play a cool game (Flash required) and test your skills, go to the eyeballing game site and play along.
Here’s how I did:
Give it a try and make a screen capture and upload it to Tinypic.com and post the link in a our comments.

I tried this, and must admit I didn’t do as well as Flanders.
Actually when I finished, the program filled in my name for me.
Check it out
http://i44.tinypic.com/14m5ixw.jpg
I did this before. My name is Mary.