The work of Euclid "Data" is the second of his purely geometric works (after "Elements") that has survived. It was written by the great mathematician many years after "Elements" and consists of a collection of propositions whose proofs are based on theorems or constructions from the "Elements".

In general, the "Data" form a well-structured geometric set without ambiguities and gaps. The study of this work not only arouses interest but also admiration among scholars. It is puzzling why this wonderful work of Euclid has not been published in modern Greece until now.