Page "Euclid" Paragraph 19

* Conics was a work on conic sections that was later extended by Apollonius of Perga into his famous work on the subject.

It is likely that the first four books of Apollonius's work come directly from Euclid.

According to Pappus, " Apollonius, having completed Euclid's four books of conics and added four others, handed down eight volumes of conics.

" The Conics of Apollonius quickly supplanted the former work, and by the time of Pappus, Euclid's work was already lost.