This latest Sir Cumference adventure features a geometry puzzle. Competing to be the chosen successor to King Arthur, young knights attempt to solve the puzzle to determine the hidden location of the king's sword, Edgecalibur. As the clues led Vertex and Radius through a series of adventures, the two men discover attributes of geometric solids including Euler's Law. Sprinkled with mathematical puns and detailed medieval paintings, this adventure provides a delightful method for introducing spatial concepts.--Ministry of Education website.

Mathematics grade 4 (2007). Mathematics grade 6 (2009).