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In this calculus activity, learners use a classic problem of geometrical probability to find an important mathematical constant (pi).

$1 - $5 per group Ages 14 - 18 10 to 30 minutes
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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.

1 cent - $1 per group Ages 8 - 18 10 to 30 minutes
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If you have 3-foot dowels and rubber bands, you can can started on this fun and open design challenge. You can make structures big and small: make it so you can fit your parent into it!

1 cent - $1 per student Ages 8 - adult 10 to 30 minutes