Scott P. Raffone
The basis for all Geometry is that we start with the 3 undefined terms; point, line and plane and use these terms to define everything else that exists. Euclid is able to describe a point, line and plane, this will illustrate our understanding of Euclidean Geometry He stated: A point is that which has no part In other words, a point has no size, it is used to mark a location He then states: A line is a breathless length He is saying that it is a length with no width It is used to describe the distance from one place to another. His last undefinable term is a plane. He uses the term surface: a surface is that which has length and breadth only. For more understanding, he is saying that. a plane or a surface is flat similar to a wall, ceiling or floor In Book I, he completes his work by describing parts of lines, figures, angles, and circles Within this book, Euclid also writes a large part on equality and the basis of number theory.