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This lecture introduces the fundamental concepts of Euclidean geometry, focusing on the Elements of Euclid. It covers the historical background of Euclid's work, the structure of the Elements, and the key propositions in each block. The lecture explores the postulates that allow the construction of figures with a straightedge and compass, the concept of distance in Euclidean geometry, and the common logical rules in mathematics. It also discusses the challenges in defining a straight line, the concept of parallel lines, and the development of non-Euclidean geometries. The lecture concludes with a discussion on the importance of the Elements in modern mathematics.