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Mathematics LibreTexts

5: Trigonometry and Right Triangles

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Trigonometry is a branch of mathematics that studies relationships between side lengths and angles of triangles. A right triangle or right-angled triangle is a triangle in which one angle is a right angle. The relation between the sides and angles of a right triangle is the basis for trigonometry.

Thumbnail: The sine and cosine function in the unit circle. (CC0; Stephan Kulla via Wikipedia)


This page titled 5: Trigonometry and Right Triangles is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Henry Africk (New York City College of Technology at CUNY Academic Works) via source content that was edited to the style and standards of the LibreTexts platform.

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