Sir Cumference and the Sword in the Cone

A funny and pun-filled retelling of “The Sword and Stone” that introduces readers to mathematical angles.

King Arthur has hidden his sword, Edgecalibur and issued a challenge to the knights. The first knight to find the sword will be the next king. Can Sir Cumference and Lady Di point Radius's best friend, Vertex in the right direction? Will Vertex's sharp thinking give him the edge?

Join Sir Cumference, Lady Di of Ameter, and their son, Radius, in this new adventure where they race to help Vertex find the sword and discover the secrets of cubes, pyramids, cylinders, and cones.

• Sir Cumference and the Great Knight of Angleland (A Math Adventure)
• Sir Cumference and the Isle of Immeter (Math Adventures)
• Sir Cumference and the Off-the-Charts Dessert
• Sir Cumference and the Viking's Map
• Sir Cumference and the Roundabout Battle
• Sir Cumference and All the King's Tens: A Math Adventure
• Sir Cumference and the Fracton Faire (Charlesbridge Math Adventures)
• Sir Cumference and the First Round Table (A Math Adventure)
• Sir Cumference and the Dragon of Pi (A Math Adventure)
• Sir Cumference Classroom Activities