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Trigonometry is the branch of mathematics which studies the relationships between the lengths of sides and angles of triangles.

Spherical Trigonometry

Spherical trigonometry is the branch of mathematics which concerns the measurement of spherical triangles and related figures on the surface of a sphere.

Also see

  • Results about trigonometry can be found here.

Historical Note

An analytic approach to Trigonometry was introduced by Leonhard Paul Euler.

Linguistic Note

The word trigonometry derives from the Greek for measurement of triangles.