Many speed squares or rafter squares have a notch by their corner. Simply drive a nail where you want the center of the circle, place your pencil in a slot or on the edge of the square, place the nail in the corner notch and rotate!
Draw Circles Without a Protractor Using a Speed Square
Submitted by Phil · Via http://homefixated.com/johnnyraftersquaretips/
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This article’s title might be better as: Draw a Perfect Circle without a Compass using a Speed Square. A protractor measures angles — a compass draws circles.