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Can I Get Some Pi?
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In this activity, learners will explore pi and the mathematical relationships between a circle's diameter, circumference, and radius.
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The Shadow Knows II
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In this activity, learners will measure the length of a shadow and use the distance from the equator to calculate the circumference of the earth.
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Applying Math to Astronomy
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In this mathematics activity (page 4 of the PDF), learners will explore the relationship between the diameter and circumference of an object.