This edition presents Lef�bure de Fourcy’s elementary treatise in translation, offering clear definitions, methodical explanations, and practical guidance. It covers core topics from trigonometric functions and tables to solving plane and spherical triangles, with a focus on building a solid foundation for higher mathematics.

Foundational definitions and concepts in trigonometry, including how logarithms relate to numerical work.
Guidance on constructing and using tables of sines, cosines, and related functions for calculations.
Methods for solving triangles and applying trigonometric identities in both plane and spherical contexts.
Historical and practical context for applying trig in mathematics and related fields.

Ideal for readers who want a robust, no‑frills introduction to trigonometry as used in higher math and related disciplines.

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