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. For example, a line tangent to a point on a curve is equal to the slope of the line at that point.
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. For example, a line tangent to a point on a curve is equal to the slope of the line at that point.