plane trigonometry

noun

, Mathematics.

1. the branch of trigonometry dealing with plane triangles.

Word History and Origins

Origin of plane trigonometry¹

First recorded in 1800–10

Example Sentences

Plane trigonometry and its application to the solution of easy problems.

From Project Gutenberg

A kind of plane trigonometry had been known to the ancient Egyptians.

From Project Gutenberg

Plane trigonometry, including the solution of practical and useful problems.

From Project Gutenberg

The harbour plans and coast sheets are constructed on the simple principles of plane trigonometry by the surveying officers.

From Project Gutenberg