It is called a tangent segment.
A tangent of a circle is a straight line that touches the circle at only one point.
radius
A Chord
Is called a radius.
The radius goes from the center out to the edge of the circle.
A line segment drawn through the centre of a circle and having endpoints on the circumference of that circle is called the diameter. Notably, a line segement with one endpoint at the centre of the circle and one anywhere on the circumference of the circle is called the radius, and is exactly half the length of the diameter.
Perpendicular lines
A tangent of a circle is a straight line that touches the circle at only one point.
diameter
radius
The Tangent Line to Circle Theorem states that a line is tangent to a circle if and only if it's perpendicular to the circle's radius.
A chord in which the diameter is the largest
A Chord
The segment you describe is the radius of the circle.
The radius-tangent theorem is math involving a circle. The radius-tangent theorem states that a line is tangent to a circle if it is perpendicular to the radius of a circle.
Is called a radius.
The radius goes from the center out to the edge of the circle.