1d, 2d, 3d! Starring Pi, Radius, Curcumference and Arc
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Circle Sections Are Linked Together With Snap Hinges. Sections Come In Radii Of 1, 2, 3 And 4 Whatever Units. Regardless Of Radius, All Sections Are Of The Same Area And Volume.* Connect Enough Sections Together (Number Required = Radius Squared) And You Can Turn The Chain Into A Circle Or Stretch Them Out Lengthwise To Find The Circumference. Wedges Also Snap Into Place Vertically To Create Volumes. *Skeptical Students? Use Hollow Versions Of The Wedges And Fill With Sand Or Water, Then Measure Required Amounts For Each Radius Size. They Should All Come Out To Be Pi Times Whatever Your Radii Are Scaled To.
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