# Circles-Diameter, Circumference, Radius and the Discovery of Pi

Seventh graders measure the diameter, circumference and radius of a circle and find pi using the diameter and circumference. In this geometry lesson plan, 7th graders work in groups to find the diameter, radius, and circumference of circles. They observe the relationship between the circumference and the radius and divide them for each circle. They compare their answers to the value of pi.

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