Plane and Spherical Trigonometry (Classic Reprint)

Mastering Trigonometry, from Planes to Spheres This classic introduction covers the core ideas of plane and spherical trigonometry, focusing on practical methods you can apply in problems and proofs. It emphasizes clear, concise explanations and accessible proofs, avoiding overly advanced topics.

This edition presents the right triangle first, then extends to oblique and spherical cases. It blends definitions, formulas, and worked solutions to help you compute angles, sides, and areas with confidence. The material is structured to support self-study or classroom use, with a steady progression from fundamentals to applications.

• Foundational definitions of trigonometric functions and their relationships.


• Step-by-step solution methods for right and oblique triangles, including area calculations.


• Introduction to spherical trigonometry, including right spherical triangles and Gauss’s equations.


• Practical problems and guidelines for using logarithms to simplify calculations.

Ideal for students, educators, and anyone seeking a solid, traditional grounding in trigonometry through both plane and spherical perspectives. This edition supports focused study and reference as you build problem-solving fluency.