Trigonometry

Trigonometry (from Greek trigōnon, "triangle" and metron, "measure") is a branch of mathematics that studies relationships involving lengths and angles of triangles.

History

The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies.

See also

• Aryabhata's sine table
• Generalized trigonometry
• Geometry
• Lénárt sphere
• List of triangle topics
• List of trigonometric identities
• Mathematics
• Rational trigonometry
• Skinny triangle
• Small-angle approximation
• Trigonometric functions
• Trigonometry in Galois fields
• Unit circle
• Uses of trigonometry

External links

• Trigonometry @ Wikipedia