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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
References to this work on external resources.
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)
2 editions of this book were published by Charlesbridge.
Editions: 1570911649, 1570911665
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