Euclid was a very famous mathematician and he is considered as the father of Geometry. His major contributions are in geometry and in his book The Elements, he gave many rules of geometry which are also used nowadays. Books of Euclid provides a base of geometry. Euclid’s ideas and theories are still considered as basics of mathematics. His most famous work was Metrica. Another contribution of Euclid was that he gave the practical ideas in mathematics. On the given link, contributions of Euclid are available in different fields of study.
Euclid contributions
Euclid contributions