Master plane and spherical trigonometry with a clear, methodical guide. Alfred H. Welsh’s Plane and Spherical Trigonometry offers a focused, classroom‑friendly approach designed for the needs of schools and colleges. The text balances theory with practical application, helping students gain confident mastery of key concepts and techniques.

This edition emphasizes modern instructional methods and a steady progression from particular problems to general laws. It covers logarithms, plane triangles, and the core relations of trigonometric functions, then moves to spherical trigonometry, with careful attention to explanation, memorization, and translation of formulae into plain language.

Definitions, theorems, and worked examples that align with standard classroom practice

Guided use of the ratio method for trigonometric functions, with convenient notation and explanations

Extensive exercises, hints, and solutions to reinforce learning and provide practice in applications

Tables and references to natural and logarithmic functions to support computation

Ideal for readers beginning or advancing study in trigonometry, this edition is well suited for math courses that stress clarity, structure, and practical problem solving.

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