Geometry:
Circles

Animal Traces

Tracing these unusual animals will teach students about speed, polygons, and circles.

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The Antigravity Machine

Ask students what they think an "antigravity machine" would do ("something that helps you work against gravity"). Tell them that you are going to show them an antigravity machine for the day’s activity.

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Circle Folding

It's amazing what you can make out of a simple circle--and what you can learn from it.

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Cookies

The best circular cookie sheet to use for baking cookies depends on the diameters of each.

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Looking for Circles

In comparing the smaller circle to the larger circle, students’ initial response is likely to be simply that the larger circle is “bigger”. This is a good opportunity to point out that one of the reasons mathematics is valuable is that it provides a way to describe relationships exactly.

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Mission to the Moon

For the orbital motion of the moon, we use the fact that the moon completes one orbit (360°) every 655 hours to set up the proportion h/655 = n/360, where h = the number of hours that have passed and n = the number of degrees that the moon has moved in its orbit.

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Rolling Cans

Students discover for themselves the relationship between the diameter and the circumference of a circle.

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Spoke Math

What geometric concepts can you identify in this video?

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Variables and Equations

Students get hands-on experience with variables and equations.

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Virtual Rocketry

Students learn how the components of a virtual model can be represented by mathematical equations as they translate sets of equations into two-dimensional shapes.

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Which Pizza?

Is half of a medium pizza more than all of a small one?

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