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March 14 is known around the world as "Pi Day."
"Pi" is something you may remember from math class. It is the number that results when the distance around a circle is divided by the distance across the circle. It is a very important number in geometry as well as for fields like construction and architecture.
Pi is an irrational number. It never ends. But the way it begins is always this: 3.14159. The date March 14, as we write it in the United States, is 3-14.
American physicist Larry Shaw started Pi Day back in 1988.
The hashtag #PiDay was the top trending topic on Twitter Tuesday. Pi Day is not just for those who enjoy numbers. Many people mark the math-inspired holiday by celebrating "pie," -- p-i-e, instead of "Pi."
Pie is a popular dessert in the United States. It is made with a crust on the outside and usually a sweet filling in the middle. Apple pie, pecan pie, and cherry pie are among the best known.
Pizza is another kind of pie. It is made with a crust, tomato sauce, cheese and other toppings. One pizza restaurant is celebrating Pi Day in a big way. The restaurant &pizza is letting customers get married at its locations in several East Coast cities.