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The Geometrica is a large collection of problems in practical geometry transmitted under the name of Hero of Alexandria. It is a later compilation, largely Byzantine, drawing on Heronian material, and its editor Heiberg does not treat it as Hero's own composition. After a preface on the practical use of geometry, it gives definitions and many worked problems on finding the areas of triangles, quadrilaterals, circles and other figures.
The Geometrica shows how Greek mathematics was taught for everyday use in surveying, building and administration. Its many numerical examples preserve methods of calculation handed down through the Heronian tradition, and it is an important source for applied mathematics in late antiquity and Byzantium.
About this edition. The Greek text comes from the Eulogikon open corpus of public-domain editions (standard reference: Heiberg, Heronis opera IV (Teubner 1912)). Every word has been analyzed with odyCy, a neural language model for Ancient Greek — click or tap any word for its dictionary form, part of speech, and complete morphology, together with the full entry from the Liddell–Scott–Jones Greek–English Lexicon (LSJ). The Geometrica is a later (largely Byzantine) compilation of Heronian material, edited by Heiberg as 'Heronis quae feruntur' and not regarded as Hero's own composition.