Last weekend, I spent some time looking through all the pictures I had taken during the past year. I ran across some pictures I had taken to put in my online portfolio that I created during my job search. This was one of those pictures.

Hands-On Circumference Activity |

The idea behind the lesson was that students would use materials to verify the formula for circumference of a circle. I would gather circular objects for my students to use to trace circles. After tracing around a circle, they would estimate the center of each circle and draw the radius. Using a ruler, students would measure the radius and use the formula to find circumference.

After arriving at an answer, students would use a ruler and scissors to cut off a piece of yarn the length of their circumference. They would then lay the yarn around the circumference of the circle to verify their answer. If the piece of yarn was too long or short, the students would need to verify their measurements and find their mistake.

I think this would be a great way to show students that the circumference formula is more than just a jumble of letters. I haven't used this in my own classroom, though.

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