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Sir Cumference and the dragon of pi : a math adventure (edition 1999)
by Cindy Neuschwander, Wayne Geehan (Illustrator)
Sir Cumference and the Dragon of Pi : A Math Adventure by Cindy Neuschwander
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Wikipedia in English
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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.
(summary from another edition)
Two editions of this book were published by Charlesbridge.
Editions: 1570911649, 1570911665
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