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Sir Cumference and the Dragon of Pi: A Math Adventure (Sir Cumference, Bk 2)
Sir Cumference and the Dragon of Pi A Math Adventure - Sir Cumference, Bk 2 Author:Cindy Neuschwander, Wayne Geehan (Illustrator) When Sir Cumference drinks a potion which turns him into a dragon, his son Radius searches for the magic number known as pi which will restore him to his former shape.