TITLE: Original proof of Pappus' Hexagon Theorem
QUESTION [5 upvotes]: Does anyone know where I can find an English translation, preferably online or in a book the library of a small liberal arts college would be likely to have, of the original proof of Pappus' hexagon theorem from projective geometry?

REPLY [8 votes]: It is in book 7 of Pappus's Collection. There is an English translation published by Springer. It's an expensive book, so I'll reproduce the proof & figure here:


It relies on earlier lemmas; there's an explanation that includes them on Wikipedia.