Exploring Circumference With Famous Circles

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Students will determine how the diameter and circumference of circles are related.

The Famous Circles

Here are links to the five circles on Google maps. Print them out to measure.

Or, I put them all into one PDF if Google Maps is giving you trouble.

There are purposefully "circles within circles" so students can interpret which circle is really the real circle to measure.


  1. First, students make a guess about how many times they'd need to go across a circle in order to equal the distance around.
  2. Next, they'll measure across printouts of famous circles.
  3. Then, using string, they'll measure around.
  4. Now, students will look for a relationship between the diameter and circumference.
  5. We reveal that the relationship is π.
  6. I explain a bit more about π.


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