# Sir Circumference and the round table (middle school lesson)

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Note: for full lesson w/handouts, see attached document

Materials:
Rope- approx 2-4 feet per pair of students.
Sidewalk Chalk- 1 per pair of students
Book- Sir Cumference and the Knights of the Round Table
Colored pencils/markers- for use on Task 3

Explain the task to the students. Put them into pairs. Once you are sure they understand the task and you have established clear guidelines about behavior walking and being outside, have each pair get a piece of chalk and rope and go to the designated area. Set the timer for 10 minutes to allow each pair to create a “perfect” circle. Let the students struggle to figure it out!!! This is how they will understand the concept and create a definition. Have early finishers try to create a second circle of a different size and consider the two questions on the student page. After 10 minutes (or sooner if all students figure it out), have a few pairs explain how they created heir circle.

Answer if all are stuck: Fold the rope in half. One student puts the ends together, and holds them on the ground to be the center of the circle. The second student stretches the rope and puts the chalk in the bend at the midpoint. The second student then drags the chalk along the ground, while pulling the role taut. Note that students figuring out the activity independently may not fold the rope. This is not a problem.

Students should be able to complete the 4-box (Frayer model) vocabulary after the exercise and discussion outside. If they need, you may have them work with a partner to complete this. Have a few students share their definition (correct one: The set of all points equidistant from a fixed point), characteristics, examples and non-examples.