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 kni...

Buy Now From Amazon

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.

Similar Products

Sir Cumference and the Great Knight of AnglelandSir Cumference and the Isle of Immeter (Math Adventures)Sir Cumference and the Fracton FaireSir Cumference and the Off-the-Charts DessertSir Cumference and the Viking's MapSir Cumference and All the King's Tens: A Math AdventureSir Cumference and the Roundabout BattleSir Cumference and the First Round Table