The Mathematical Experience, Study Edition - Philip Davis, Reuben Hersh, Elena Anne Marchisotto - Google Books

https://books.google.de/books?id=KcafKzslE_AC&pg=PA159&dq=is+defined+as+2+inside+a+mega-gon&hl=de&sa=X&ved=0ahUKEwjt3NeMybveAhWj

Winner of the 1983 National Book Award!"...a perfectly marvelous book about the Queen of Sciences, from which one will get a real feeling for what mathematicians do and who they are. The exposition is clear and full of wit and humor..." - The New Yorker…