Neuschwander, Cindy. <br/><br/>
Sir Cumference and the Great Knight of Angleland :  a math adventure / 
by Cindy Neuschwander ; illustrated by Wayne Geehan. 
 - Watertown, Mass. :  Charlesbridge,  c2001. 
 - 32 p. :  col. ill. ;  25 cm. 
<br/><br/> To earn his knighthood, Radius must find and rescue a missing king. His father, Sir Cumferance, and his mother, Lady Di of Ameter, give him a circular medallion (a protractor) that he uses to find his way through a maze of many angles. 
<br/><br/><label>ISBN: </label>1570911703 (lib. bdg.) 9781570911705 (lib. bdg.) 157091169X (pbk.) 9781570911699 (pbk.) 9780756917524 (PFLN) 0756917522 (PFLN) 
<br/><br/><label>LCCN: </label>00011666 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry--Juvenile literature.<br/>Geometry.
<br/><br/><label>LC Class. No.: </label>QA 445.5  / .N49 2001