What is 'the Elements' by Euclid about?

Answer 1

Euclid's thirteen volume work called Elements outlines, explains, and provides the proofs of the basic concepts of mathematics that had been determined by Greek and Egyptian mathematicians by the third century BC. An element is the basic part or principle of anything, an object or an idea. His compilation of the elements of mathematics is still in use over two thousand years later, and remains the foundation of basic geometry taught in schools to this day.