The side that is not adjacent to another side of a triangle is called the opposite side.
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The side of the triangle next to the angle is called the adjacent side.
the tangent of an angle is opposite over adjacent side of triangle
That's the cosine of the angle to which the 'adjacent' side is adjacent.
use right triangle trig... sin (angle) = opposite side/hypotunese, cos (angle) = adjacent side/hypotunese, and tan (angle) = opposite side/ adjacent side
The adjacent side or base of the triangle.