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Pi Day

Posted by WMHT Web Editor on
PBS LearningMedia

March 14, of course, is Pi Day! Since Pi is a very special ratio, it calls for a very special holiday. Take students inside the world of π with "All About the Holidays'" overview of this amazing ratio! 

Pi is the ratio of a circle's circumference – the distance AROUND the circle – to its diameter – the distance ACROSS the center of the circle. No matter how big or small the circle is, this ratio is always pi, or approximately 3.14. We use the approximate value because it’s a lot easier than using its true value. Watch the video with your class, and teach them more fun facts about pi!



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