tangent

- noun a trigonometric function
__equal__to the length of the side opposite the angle of a right-angled triangle divided by the length of the adjacent side

- For a right triangle, the
__ratio__of the length of the side opposite to an acute angle, to the length of the side adjacent to said acute angle. It is the same as the ratio of the__sine__to the cosine. Its abbreviation is tan. - A
__line__,__curve__, or__plane__which touches another curve or surface at a single point, but does not intersect it.

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