Sir Cumference and the Dragon of Pi - Cindy Neuschwander
Sir Cumference, Lady Di of Ameter and Radius are back in their second Math Adventure! This time, a potion has changed Sir Cumference into a fire-breathing dragon. Can Radius change him back?
Join Radius on his quest through the castle to solve a riddle that will reveal the cure. It lies in discovering the magic number that is the same for all circles. Recommended for grades 2 to 4.