It is called a tangent.
tangent
A tangent.
That is a tangent line.
The tangent line intersects the circumference of a circle at just one point.
tangent
Definition: a tangent is a line that intersects a circle at exactly one point, the point of intersection is the point of contact or the point of tangency. a tangent is a line that intersects a circle at exactly one point, the point of intersection is the (point of contact) or the **point of tangency**.
If a line intersects a circle at exactly one point, it is a tangent to that circle
Such a line is called a tangent line or a tangent to the circle. [Tangent is Latin for touching-- a tangent line touches the circle at just one point. ]
A line segment that intersects with or joins two points on a circle is called a chord.
A tangent line.
A chord.