May Math Forum Project: Pentagon from a Circle

I ran across this nice animation on creating a pentagon from a circle (taken from Wikipedia):


I thought this would make a great Math Forum project, and I just posted it as this month's free project.

It's a neat exercise in 2D thought: starting with one common object, a circle, and without knowing any numbers or angles, creating all the necessary lines to make a pentagon.

The Student Version has a question at the end about the number of circle segments you need to use for this project. The Teacher Version has the answer.

Enjoy!


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