Trigonometry is the branch of mathematics that studies triangle angles and lengths. Trigonometric functions go beyond the
simple study of triangles.
They are used to describe properties of angles, relationships in triangle, and the graphs of any recurring cycle.

Basic trigonometry involves the ratios of the sides of a right triangle. The common ratios are called sine (sin), cosine (cos), and tangent (tan)..

Trigonometry is used in evaluating measurements of height, distance, and angles. It is used extensively in surveying, statistics, navigation, engineering, astronomy, and other fields.

Here is a listing of all the trigonometry lessons available in this section.

- Introduction to Trigonometry
- Angle measurements
- Arc length

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