Q:
# What Are the Branches of Trigonometry?

**The two main branches of trigonometry are plane trigonometry and spherical geometry.** Trigonometry in general deals with the study of the relationships involving the lengths of angles and triangles.

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Plane trigonometry focuses on the relationships between the angles and sides of triangles that have three vertices located on the surface of a plane. Students studying plane trigonometry learn about concepts like right angles, straight angles, acute angles, complimentary angles and supplementary angles. Since the triangles are all located on a plane, the sum of the angles is always 180 degrees.

In spherical trigonometry, students study curved triangles drawn on the surface of a sphere. This design means the sum of the angles of these triangles is higher than 180 degrees. Spherical trigonometry is used in astronomy and navigation.

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