This e-textbook is a compilation of the current $1Geometry Study Guide Downloads series with an immediate solution steps section for the problem section of each chapter; immediately after each problem section is the solution steps section. This compilation composes a cost-effective, well-illustrated textbook for a Euclidean geometry course with applications to related topics. Some of the related topics are high school algebra I, planar and spherical distance, spherical triangles, the rarely seen or studied geodesical function, and the rarely seen or used cross-sectional, illustration-oriented approach to the study of four-dimensional spheres.