plane trigonometry


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Related to plane trigonometry: spherical trigonometry

plane trigonometry

[′plān trig·ə′näm·ə·trē]
(mathematics)
The study of triangles in the euclidean plane with the use of functions defined by the ratios of sides of right triangles.
References in periodicals archive ?
The objective of this exercise is to derive a formula for the number of hours from sunrise to sunset on a given day of the year and at a given latitude using only basic plane trigonometry and some simple formulae from analytic geometry.