Sir Circumference and the Dragon of Pi by Cindy Neuschwander, illustrated by Wayne Geehan. Sir Circumference is a silly story that uses finding pi as a solution to a problem: the Knight Sir Circumference has been turned into a dragon. Characters named Radius and Lady Di of Ameter help him by finding a potion with poetic instructions telling

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Circles by David Adler, illustrated by Edward Miller. Adler’s book introduces circles and then describes a hands-on method of learning what a diameter and radius are (tracing a plate, then folding symmetrically and drawing lines). Subsequent pages continue the hands-on directions to draw and define major and minor sectors of a circle and how to draw

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