Integrating literature of any kind into your math lesson is always a great change of pace for your students. At first they might think it is strange to be reading in math, but by the end they always enjoy it!
Within this resource you will find an activity that has been created to be used with the book, "Sir Cumference and the First Round Table" by Cindy Neuschwander (story not included).
This series of books is easily integrated within any Geometry unit. However, I think the theme of this particular book is best used as a review of perimeter, and an introduction to circles.
Make sure to check out the whole "Math Stories" collection here!