In the DIY world, circles are notoriously difficult to perfect. Although it's easy to find tools that can help you perfect straight lines or shapes with straight lines in them, it's hard to find tools that can help you perfect a circle. But in a strange turn of events that doesn't seem to make sense, you can actually use a square tool to draw a circle if you want to!
Simply mark your diameter points and place nails on either side of this diameter, place a pencil in the corner of the square, and then rotate it around the nails.