Key To Plane And Solid Geometry is a comprehensive textbook on geometry, written by Durell and Fletcher and first published in 1917. The book is divided into two parts, with the first part covering plane geometry and the second part covering solid geometry. Each part is further divided into chapters that cover specific topics, such as angles, circles, polygons, and polyhedra. The book is intended for students who have already studied the basics of geometry and are looking to deepen their understanding of the subject. The authors assume that readers are familiar with the basic concepts of geometry, such as points, lines, and planes, and have already studied the properties of triangles and quadrilaterals. Throughout the book, the authors use clear and concise language to explain the concepts and theorems of geometry. They provide numerous examples and exercises to help readers practice and apply what they have learned. The book also includes diagrams and illustrations to aid in understanding the concepts. Overall, Key To Plane And Solid Geometry is a classic and timeless textbook that provides a thorough and comprehensive introduction to the subject of geometry. It is a valuable resource for students, teachers, and anyone interested in the study of mathematics.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.