Sir Cumference helps solve a problem at the king's round table meeting. The original table was a rectangle, making it difficult for all the knights to see and hear. Sir Cumference tries different shapes like a square, diamond, and oval but none work well. His wife, Lady Di, suggests making the table completely round. Sir Cumference does this, and the circular table is a success with everyone having equal space. He then develops a way to measure the circumference of a circle.