In this edition, plane and spherical trigonometry are treated in a simple, practical way. The functions are defined as ratios, but line-based representations are introduced early, offering flexibility in solving problems. The text emphasizes graphical methods, especially for spherical triangles, and includes careful treatment of imaginary quantities and hyperbolic functions. It also highlights essential formulas for triangle solutions and provides rigorous guidance on computing tables.

You’ll find carefully chosen exercises throughout, plus a large set of miscellaneous problems to drill concepts. The accompanying tables extend beyond five‑place values to four‑place tables, Napierian logarithms, and other useful data to support computation and practice.
What you will experience

A balanced blend of theory and hands-on practice for both forms of trigonometry
Clear guidance on graphs, line methods, and practical problem solving
A broad collection of exercises and extensive reference tables
Focus on essential formulas and reliable table computation in one concise package

Ideal for readers seeking solid, classroom-ready instruction in trigonometry that blends traditional methods with modern, visual approaches.

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