""Plane Trigonometry"" by Sidney L. Loney is a comprehensive textbook that covers the fundamental principles and applications of trigonometry. The book is designed to help students develop a strong foundation in the subject, with a focus on plane trigonometry. The author explains the concepts of trigonometry in a clear and concise manner, using examples and diagrams to illustrate the principles. The book covers all the important topics in plane trigonometry, including angles, triangles, functions, and identities. It also includes chapters on inverse trigonometric functions, logarithmic and exponential functions, and complex numbers. The book is suitable for students of all levels, from high school to college, and is an essential resource for anyone studying mathematics, engineering, or physics. With its clear explanations and comprehensive coverage, ""Plane Trigonometry"" is an indispensable guide to mastering the subject.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.