6th graders calculated pi, measuring circumference and diameter with yarn

In math the 6th graders investigated the relationship between the diameter of a circle and the circumference.  Using various circular classroom items, they first used a piece of yarn to measure the diameter, and then they figured out how many diameters fit in one circumference.  They discovered that there are about 3 1/7 or 3.14 diameters in the circumference.  This measurement of Pi actually goes way back to the Babylonians who calculated Pi about 4000 years ago!

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