Chapters: The Algebra of the Real Numbers; Incidence Geometry in Planes and Space; Distance and Congruence; Separation in planes and space; Angular measure; Congruences between triangles; Geometric inequalities; The euclidean program: congruence without distance; Three geometries; Absolute plane Geometry; The parallel postulate and parallel projection; Similarities between triangles; Polygonal regions and their areas... and many more!