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Making contact at a single point or along a line; touching but not intersecting.
Tangent, written as tan(θ), is one of the six fundamental trigonometric functions.
Tangent definitions
There are two main ways in which trigonometric functions are typically discussed: in terms of right triangles and in terms of the unit circle. The right-angled triangle definition of trigonometric functions is most often how they are introduced, followed by their definitions in terms of the unit circle.
https://www.thefreedictionary.com/tangent
https://www.math.net/tangent