Join Sir Cumference, Lady Di of Ameter, and their son Radius for
wordplay, puns, and problem solving in this angle-packed math adventure.
In the third installment of the beloved Sir Cumference series, Radius
must prove himself on his quest for knighthood by rescuing a king. Sent
off with the family medallion for luck, Radius dodges dangers and
dragons. The ultimate challenge lies in a mysterious castle with a maze
of many angles.