Neuschwander, Cindy

Sir Cumference, Radius, and Sir Vertex search for Edgecalibur, the sword that King Arthur has hidden in a geometric solid.

Sir Cumference, Radius, and Sir Vertex search for Edgecalibur, the sword that King Arthur has hidden in a geometric solid.

To earn his knighthood, Radius must find and rescue a missing king. His father, Sir Cumference, and his mother, Lady Di of Ameter, give him a circular medallion, (a protractor), that he uses to find his way through a maze of many angles.

Radius, son of Sir Cumference, embarks on a quest to find the magic number known as pi in order to restore his father--who has been turned into a dragon--to his original shape.

When young Per visits her uncle Sir Cumference, aunt Lady Di of Ameter, and her cousin Radius, they teach her how to play Inners and Edges.

Sir Cumference and his wife, Lady Di of Ameter, host a surprise birthday party for the king and must quickly count all the guests.

A math adventure in which King Arthur finds the perfect shape for his table with the ideas of his wife and son, and the assistance of his knight, Sir Cumference.

Amanda loves to count everything, but not until she has an amazing dream does she finally realize that being able to multiply will help her count things faster.