Summary
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).
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Teaching resources
Discussion questions
Discussion
Short explainer (2 min) from PBS LearningMedia's *All About the Holidays*.
- What two measurements does pi compare?
- Why is Pi Day on March 14?
- Where do you see circles in this room?
Quick work-a-long
Vocabulary: pi, circle, circumference, diameter.
Try it: Wrap a string around a round lid, then lay the string across the lid. About how many times does the width fit around the outside?