The Elements of Euclid - Part 1 In Richard Fitzpatrick’s translation the seventh proposition of Book 1 of Euclid’s Elements reads: GreekEnglish ̓Επὶ τῆς αὐτῆς εὐθείας δύο ταῖς αὐταῖς εὐθείαις ἄλλαι δύο