adjacent opposite hypotenuse
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Right, acute, and obtuse...
Angles were known before trigonometry. Trigonometry was the study of angles and their relationship to shapes.
The main kinds are plane trigonometry and solid trigonometry. The latter will include trigonometry in hyper-spaces.
The basic principle of trigonometry is that there are mathematical relationships between the sides and angles of a triangle.
The study of triangles: its sides and angles.