Circle March 14, on your calendar. Why? Pi! National Pi Day is 3/14. The date is a perfect time to celebrate this important number, which is often rounded off to 3. 14.
Thousands of years ago, mathematicians in ancient Babylon, Greece, and Egypt noticed that there was a same strange number when dealing with problems with the circle. But they didn't use the name pi for this number until William Jones gave the number its now-famous name. A book he published in 1706 referred to it as pi and represented it with the Greek letter π.
The world's first Pi Day celebration was masterminded by Larry Shaw, who worked at a science museum in San Francisco, California. On March 14, 1988, many people paraded around （in a circle, naturally） with posters of pi on the street under Shaw's lead. It was also Shaw who served pies as refreshments in a stroke of genius. After that, the event became a tradition at the museum.
Soon, the idea caught on with math-minded party people around the world and they hold different activities to celebrate the day. You can enjoy some pie, pizza, or pineapple on that day. Some bakeries and restaurants offer deals. You might pick up some tasty pie or pizza at the price of ＄3. 14. Or you can make a "pi-ku" poem. The first line has 3 words, the second has 1, and the third has, you guessed it, 4.
While the holiday is meant to be piles of pi-themed fun, it has a serious point--to encourage students' interest in math and science. That's why the U. S. government made March 14th as National Pi Day in 2009.
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