What are the major achievements of Euclid?

Answer 1

Euclid is best known for his treatise on mathematics, The Elements. His book is one of the most influential works in the history of mathematics, serving as the main textbook for teaching math, especially geometry, from the time of its publication until the late 19th or early 20th century. The Elements is a mathematical and geometric treatise consisting of 13 books written in Alexandria at around 300 BC. It is divided into thirteen books which cover plane geometry, arithmetic and number theory, Irrational Numbers, and solid geometry, such as definitions, propositions, theorems, constructions, the five postulates (axioms), and mathematical proofs of the propositions. Axioms are statements that are accepted as true.