King Arthur has issued a challenge. The first knight to find the sword Edgecalibur will be the next king. Join Sir Cumference, Lady Di of Ameter, and Radius as they help their friend, Vertex, find the sword. Discover the secrets of cubes, pyramids, cylinders, and cones. 32 pages. 8 1/2" x 9 1/2". Ages 5-10.