## Trigonometry

Trigonometry
deals with triangles, particularly triangles in a plane where one angle
of the triangle is 90 degrees (right triangles). It specifically
deals with the relationships between the sides and the angles of
triangles; the trigonometric functions, and calculations based upon
them. Trigonometry is typically taught in secondary schools,
often in a precalculus course. Trigonometry topics include the following:

- Angle Measurement
- Radians/Degrees
- Minutes, Seconds

- Trigonometric Identities

- Oblique Triangles