Plane trigonometry

	the branch of trigonometry in which its principles are applied to plane triangles.
	those branches of trigonometry in which its principles are applied to plane triangles and spherical triangles respectively.

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.

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