## Illuminations: Computing Pi

I imagine the proper refreshment for the celebration of Pi Day, March 14, 3-14, is, of course, a piece of pie. While you are enjoying the shape of the pie, you can consider the calculations of Archimedes, who inscribed and circumscribed many-sided figures around a circle and calculated their perimeters to approximate pi. With the instructions on this interactive site you can explore Archimedes’ method as well as the method of using the areas of polygons, both inscribed and circumscribed. Change the values of n to see how the changes affect finding the approximation of pi.http://illuminations.nctm.org/ActivityDetail.aspx?ID=161

## Exploratorium: Pi Day: Events, Activities, and History

Exploratorium: Pi Day: Events, Activities, and History

Celebrate International Pi Day with the renowned science museum in San Francisco, the Exploratorium. Ironically, March 14 is also the birthday of Albert Einstein, which Exploratorium also celebrates. If you can’t get to the Bay area, the site tells you how you can join in the festivities via explo. tv beginning at 1:00 PDT. Find out some interesting facts about the history of π and its calculation, which has been refined over the past 4000 years. Among the activities listed are two hands-on activities, one of which shows students why the formula for finding the circumference of a circle is C=πd.http://www.exploratorium.edu/pi/