There is Pi all around us, in ways you may not have seen before. If you remember from school, Pi is the ratio of a circle's circumference to its diameter. It is a number that is usually written as ...
SAN FRANCISCO (KGO) -- In honor of Pi Day on March 14, Exploratorium scientist Julie Yu demonstrates how to measure pi using a string and real fruit pie. Watch the video above to see how it's done.
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