180-Degree Stars

Here’s another clip by Dr. Tanton. This clip proves that any 5-pointed star will have interior angles whose angles sum to 180-degrees.

As you watch this video, make sure to take special note of the method that gets used to prove this conjecture. Is it inductive? Is it deductive?

This is a great example of someone “proving” a statement without seeming like he is “doing a proof.”

For the record, I also like his statement regarding the basic geometric angle sums: 180 and 360. Listen for that.

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