# trigonometry

/tɹˌɪɡənˈɒmətɹi/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/trigonometry
Updated: 2026-05-28

## Definition

the branch of math that studies the relationships between the sides and angles of triangles. You use it to solve problems involving height, distance, and angles.

For teachers: the branch of mathematics dealing with the relations of the sides and angles of triangles and with the trigonometric functions. Often used in fields such as engineering, physics, and navigation.

## Examples

- I am studying trigonometry to help with my physics homework.
- The architect used basic trigonometry to calculate the exact angle of the roof's slope.
- Advanced trigonometry allows for the precise modeling of periodic phenomena, such as sound waves and the oscillation of mechanical systems, through the use of sine and cosine functions.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.