For laying out circles where the exact radius isn’t critical, I like to use a scrap of perforated hardboard.

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For laying out circles where the exact radius isn't critical, I like to use a scrap of perforated hardboard. Drive the tip of a brad into the center of your workpiece, then slip the hardboard over the brad. Place your pencil tip in the hole closest to the radius of your desired circle and give it a spin!
—Sheryl Munyon, WOOD® magazine