Euclid's Elements Book One with Questions for Discussion

Book 1 of Euclid's Elements is a foundational text that lays the groundwork for all subsequent books by establishing the basic principles of geometry. It begins with definitions for geometric concepts like points and lines, followed by five postulates and five common notions, which serve as the axioms for the entire work. The book then presents theorems and their proofs, with a major focus on the properties of triangles, culminating in the construction of an equilateral triangle on a given line segment.