Sir Cumference is a character from a series of books who loves math and is very clever! He lives in a castle and likes to solve problems using math.
One of Sir Cumference's favorite things to do is measure circles. You know how a circle is round like a cookie? Well, to measure a circle, you need to find the distance around the outside of it. That distance is called the "circumference."
Sir Cumference has a special way of measuring the circumference using a piece of string. He puts the string around the circle and then measures how long it is. That gives him the circumference!
But Sir Cumference doesn't just measure circles for fun. He uses math to solve all sorts of problems in his castle. For example, if the knights need to build a circular moat around the castle, Sir Cumference can help them figure out how much digging they need to do to make it the right size.
Overall, Sir Cumference is a very smart and helpful friend when it comes to math and measurement!