The Elements of Plane Trigonometry, by William P. Durfee, offers a solid introduction to the science of trigonometry and its use in real calculations. This edition emphasizes computation, accuracy, and the use of logarithms to solve problems efficiently.

This book develops both the theory and the practice of trigonometry. It starts with the foundations of approximate numbers and the role of logs in computations, then guides you through right triangles, unlimited angles, and reduction formulas. There are plenty of worked examples, tables, and exercises designed to build skill in estimation, checking results, and applying trigonometric ideas to practical tasks.
What you’ll experience

Clear explanations of trig functions, their relationships, and how to use logarithms in calculations
Step-by-step methods for solving triangles and handling problems with accuracy
Hands-on practice with interpolation, table use, and error management
A progressive sequence of chapters from computation basics to applications in triangles and angles

Ideal for readers who want a solid, hands-on foundation in plane trigonometry, whether for study, teaching, or self‑paced learning. This edition is well suited to students needing practical computation skills and a reliable reference in classical trigonometry.

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