Apedia

Line Curve Curved Tangent Noun Straight Plane Touches

Front
noun
1
a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.
tangent 1
2
a completely different line of thought or action:
3
Mathematics
the trigonometric function that is equal to the ratio of the sides (other than the hypotenuse) opposite and adjacent to an angle in a right-angled triangle.
adjective
(of a line or plane) touching, but not intersecting, a curve or curved surface.
Back tangent

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