Trigonometry

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

History o

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

See also

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

External links

• Trigonometry @ Wikipedia