A speed square has many obvious uses for marking up your building materials. Here's a small hidden feature you may not know about: it can also draw perfect circles.
Most speed squares have a notch at the 90 degree corner which is used to determine angles. To draw a circle using this notch you just need to place a nail at the center of your desired circle and then put your notch on the nail and using a pencil, walk the speed square around the nail to draw a circle.
Draw Circles Without a Protractor | HomeHacks
Photo by HomeHacks.
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