# Definition:Trigonometry

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## Definition

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

## Also see

- Results about
**trigonometry**can be found here.

## Linguistic Note

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

## Historical Note

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

## Sources

- 2008: Ian Stewart:
*Taming the Infinite*... (previous) ... (next): Chapter $5$: Eternal Triangles