Sir Cumference Math Adventure Book Set by Cindy Neuschwander

Follow the adventures of Sir Cumference, Lady Di of Ameter, Radius, and their friends as they are confronted with riddles they must solve. Mathematical concepts, angles, the number Pi, dimensional shapes, and degrees all find there way into with stories with fun word-play and puns and problem-solving that make new terms easy to remember. New mathematical concepts are introduced with each story in these 7 books.  The books in this set include:  Sir Cumference and the First Round Table - When King Arthur's knights get together, they sit at such a long table that everyone has to shout to be heard. Can Sir Cumference and Lady Di Ameter "measure up" to the challenge of building a better table? Sir Cumference and the Dragon of Pi - Sir Cumference has been changed into a fire-breathing dragon. Can Radius solve the riddle that will reveal the cure? It lies in discovering the magic number that is the same for all circles. Sir Cumference and the Great Knight of Angleland - Adventure by degrees.