With Pi Day (March 14th.....3.14) over spring break, we celebrated the idea today in class. Working backward, students measured a variety of round pies to find circumference. Next, they measured as accurately as they could the diameter. Finally, the divided circumference by diameter to realize that 3 is almost always found. After explaining that this means the circumference is about 3 times that of the diameter, we put all the data in Excel and found that our class average of all the groups' measurements was 3.12. Not bad for measuring pies that are not 100% round.
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