In this paper we publish and translate three versions of the so-called Book XIV of Euclid's Elements : one in Greek, two in arabic. This book deals with the comparison of two of the regular polyhedra, dodecaedron and icosahedron. It derives from a monography by Hypsicles, a geometer who lived in the first half of the second century B.C. We examine the history of this text from Antiquity to Middle-Ages, arabic and latin, its relationships with Euclid, Apollonius, Aristaios and Pappus. We compare the different versions, Greek, Arabic and arabo-Latin and we try to understand the very complex processus of transmission. As a study case, it can help also for the history of the transmission of Euclid's Elements themselves. The second part contains the Arabic tradition of Book XIV (editions and french translations of two arabic versions, one quite similar to Greek, another one with editorial reworking) and a complete comparison of the different versions.