A tangent is a line that just touches a curve at a single point and its gradient equals the rate of change of the curve at that point.
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A tangent to a circle is a line from a point outside the circles which touches the circle at a single point.
"tangent" meaning is a line or plane which touches a given curve or solid at a single point.Therefore, by definition there is no tangent to a line.if it were parallel it would not touch.if it were coincident it would touch in all places.
Tangent line is a graph. This graph is to gather data.
A common tangent is a line which is tangent to two (or more) curves.
A line, although often a segment is also called a tangent.