Sir Cumference and the Great Knight of Angleland chronicles Sir Cumference's son, Radius, in a quest to earn his knighthood by rescuing a king. The circular medallion (a protractor) given to Radius by his father and his mother, Lady Di of Ameter, aid him in examining every angle along the way. Reading Level: Grade 2-5
"Radius, the son of Sir Cumference and Lady Di of Ameter, ventures on a heroic quest to earn his knighthood. He first proves his ability to make a "knightly right angle," as Sir D'Grees has trained him, and then doubles the right angle to make a straight angle. So he is sent off with the family medallion, in the shape of a circle, to resue the missing King Lell. Falling bridges, a cryptic riddle, a crocodile-infested moat, and a winding labyrinth all must be mastered before finding the king and his twin dragons, known as "Pair of Lells."
Sir Cumference has something to offer a wide range of readers. Some will be too young to understand the math and the word puns but will enjoy the story of a knight rescuing a king. Others will puzzle over the math and how to use the protractor (medallion) to solve the riddle. This group will be helped by the pictures, which give clues to these angled decisions and enhance the story of a brave knight on his quest. Still other children will note the story, groan at the puns, and wish for more sophisticated illustrations. This book has a stronger story line than that found in most math books. It should be useful to creative teachers and fun for the right child." School Library Journal, February, 2002