Neuschwander, Cindy. <br/><br/>
Sir Cumference and the dragon of pi :  a math adventure / 
by Cindy Neuschwander ; illustrated by Wayne Geehan. 
 - Watertown, MA :  Charlesbridge,  1999. 
 - 32 p. :  col. ill. ;  24 cm. 
<br/><br/> 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. 
<br/><br/><label>ISBN: </label>1570911665 (jrb) 1570911649 (soft) 
<br/><br/><label>LCCN: </label>99010185 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Circle--Juvenile literature.<br/>Circle.<br/>Pi.
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Informational.
<br/><br/><label>LC Class. No.: </label>QA484  / .N48 1999 
<br/><br/><label>Dewey Class. No.: </label>516/.15