Pi is a very special ratio which calls for a very special holiday! Pi is the ratio of a circle’s circumference (distance around the circle) to its diameter (distance across the circle).
PBS LearningMedia: Pi Day
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Resource Link: https://lpb.pbslearningmedia.org/resource/c4184be2-883d-4a74-b7a4-be6322fbb1f6/pi-day-all-about-the-holidays/
( Link may be down. We are checking into it. )