What's better than the center of a circle? A spare car key without leaving home! I started Tom's Key Company (https://tomskey.com/?utm_source=Tomah...) so you can get quick and affordable DIY spare car keys and fobs shipped to your front door.

You can find the center of a circle easily with a ruler! A little geometry lesson about chords and you'll be there.
Need a square? Find one on Amazon: http://www.amazon.com/s/?_encoding=UT...