University of KashanMathematics Interdisciplinary Research2538-36394120190601An Overview of Mathematical Contributions of Ghiyath al-Din Jamshid Al-Kashi [Kashani]11198876510.22052/mir.2019.167225.1110ENMohammad K.AzarianUniversity of Evansville,
1800 Lincoln Avenue, Evansville, IN 47722 USAJournal Article20171021In this paper, we study Ghiyath al-Din Jamshid al-Kashi's (1380-1429 A.D.) main mathematical achievements. We discuss his al-Risala al-muhitiyya ("The Treatise on the Circumference"), Risala al-watar wa'l-jaib ("The Treatise on the Chord and Sine"), and Miftah al-hisab ("The Key of Arithmetic"). In particular, we look at al-Kashi's fundamental theorem, his calculation of pi, and his calculation of sin1<sup>°</sup>.http://mir.kashanu.ac.ir/article_88765_f17cdd08b35b70ad827078a7c1a8262a.pdf