Ordinary trigonometry studies triangles in the Euclidean plane R 2 {\displaystyle \mathbb {R} ^{2}} . There are a number of ways of defining the ordinary Euclidean geometric trigonometric functions on real numbers, for example right-angled triangle definitions, unit circle definitions, series definitions, definitions via differential equations, and definitions using functional equations.
Ordinary trigonometry studies triangles in the Euclidean plane R 2 {\displaystyle \mathbb {R} ^{2}} . There are a number of ways of defining the ordinary Euclidean geometric trigonometric functions on real numbers, for example right-angled triangle definitions, unit circle definitions, series definitions, definitions via differential equations, and definitions using functional equations.
Source: Wikipedia "Generalized trigonometry" · CC BY-SA 4.0
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