This classic text introduces the fundamentals of trigonometry through the concept of a single rotating angle, using plain language and many worked examples. It covers how angles are measured, how they relate to displacements, and how these ideas connect to the broader triangle world.

The book builds from basic definitions to practical techniques, including how to describe angles in degrees, minutes, and seconds; the idea of rectangular measure; and the relationships between sides and angles in triangles. It uses diagrams and step‑by‑step calculations to make the concepts easy to follow.

Clear definitions of angle, displacement, and direction (clockwise and counter‑clockwise).
Practical guidance on measuring angles and converting between units (degrees, minutes, seconds, and decimal form).
Foundational results on the relationships between sides and angles in triangles, plus early trigonometric identities.
Introduction to inverse notation and solving basic trig equations with worked examples.

Ideal for readers seeking a solid, older-school foundation in trigonometry that emphasizes understanding over memorization.

"About this title" may belong to another edition of this title.

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