This a unit with the book Sir Cumference and the First Round Table by Cindy Neuschwander. The lesson includes a literature component that provides questions that go along with the book. It includes a math modeling activity that models the tables from the book and allows students to work their way through each of the different shaped tables and discuss the perimeter and area of each. It concludes with a handout for students to convert between diameter and radius. I also have a unit that goes with the book Sir Cumference and the Dragon of Pi. If you need other products for middle school check out my store Prince's Products for the Middle.