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https://puzzling.stackexchange.com/questions/17681/five-angles-in-a-star
A Proof that the Vertex Angle Sum of a Pentagram is 180 degrees
A Proof that the Vertex Angle Sum of a Pentagram is 180 degrees
http://proofsfromthebook.com/2013/08/04/angle-sum-of-a-pentagram/
https://en.wikipedia.org/wiki/Star_polygon
Further reading
http://www.math.nsysu.edu.tw/~wong/papers/soa-SEAM-formatted.pdf
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