Line segment joining the centre to any point on the circle is
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Line segment joining the centre to any point on the circle is
radius of the circle.
diameter of the circle.
secant of the circle.
tangent of the circle.
By definition, the radius is the line segment from the center to any point on the circle.
By definition, a circle is the set of all points in a plane that are at a fixed distance from a central point. The fixed distance from the center to any of these boundary points is called the radius. Thus, the line segment joining the center to any point on the circle is its radius.