Pi Day!

Measuring diameter.

My class discovered the value of Pi by measuring the diameter and the circumference of a number of circular objects. We then divided the circumference by the diameter and got close to Pi in every instance.

We used 5-quart ice cream covers, soft drink covers, Lego tires of various sizes, and cardboard pizza rounds, and various other circles.

One student asked, "Does this work with every circle? Would it work with the size of the earth?"

We googled the diameter and circumference of the Earth and divided them.

Our results?

3.14!

After that we celebrated with cherry pie and whipped cream!

Circumference.