Geometry Of Four Dimensions : Kessinger Publishing : 9781161623192 : 1161623191 : 23 May 2010 : ""Geometry of Four Dimensions"" is a mathematical treatise written by Henry Parker Manning that explores the concept of four-dimensional geometry. The book is divided into two parts, with the first part introducing the reader to the basic principles of three-dimensional geometry and the second part delving into the more complex realm of four-dimensional geometry. The book begins by explaining the fundamental concepts of points, lines, planes, and angles in three-dimensional space before moving on to discuss the properties of polyhedra, circles, and spheres. The second part of the book introduces the concept of a fourth dimension and explores how it can be visualized and understood mathematically. Manning uses a variety of geometric models and diagrams to help readers understand the complex concepts presented in the book. He also includes numerous exercises and problems for readers to solve,