Plane Trigonometry by Sidney L. Loney is a comprehensive textbook on the subject of trigonometry. The book covers all the essential topics, including the definition of trigonometric ratios, the properties of triangles, and the application of trigonometry to solve problems in various fields such as astronomy, physics, and engineering. The author presents the material in a clear and concise manner, making it easy for students to understand and apply the concepts. The book includes numerous examples, exercises, and problems with solutions to help students practice and master the material. Additionally, the book features a detailed appendix that includes tables of logarithms, sines, and tangents for easy reference. Overall, Plane Trigonometry is an excellent resource for students and teachers of trigonometry.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.