A third math adventure, Sir Cumference and the Great Knight of Angleland by Cindy Neuschwander, illus. by Wayne Geehan, chronicles Sir Cumference's son, Radius, in a quest to earn his knighthood by ...
In the seventh addition to the Sir Cumference series, cousins Per and Radius are lost in the medieval countryside when they discover a map decorated with two hand “axes” featuring X and Y coordinates.
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