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Fourth grade teacher Jessica Beerbaum talks about a polygon to 7th grader Citalli Aguilar, 13, while at Meadow Homes Elementary in Concord, Calif. on Thursday, March, 14, 2013. The school celebrated Pi Day, or March 14, The school celebrated Pi Day, or March 14, in honor of the the number 3.14159, the ratio of a circle's circumference to its diameter.Retired mechanical engineer Al Beerbaum, of Walnut Creek, created the 10 ft. tall polygon out of metal tubing. Beerbaum's wife Jessica Beerbaum teaches 4th grade at Meadow Homes. (Jose Carlos Fajardo/Staff)

Students at Meadow Homes Elementary School in Concord, including fourth-graders Jake Garcia, 9, left, and Yajayra Gonzalez, 9, spin a polygon constructed of metal tubing as the school celebrated Pi Day on March 14. The 10-foot-tall sculpture was created by Al Beerbaum, above, a retired mechanical engineer whose wife, Jessica Beerbaum, teaches at Meadow Homes. Pi -- 3.14159 -- is the ratio of a circle's circumference to its diameter.

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