RADIUS
        The radius of a circle is the distance from the 
center of a circle to any point on the circle ; or
the length of such a segment, which is half a
diameter.
center of a circle to any point on the circle ; or
the length of such a segment, which is half a
diameter.
          A line segment whose endpoints lie on the circle
and which passes through the centre; or the length
of such a line segment, which is the largest distance
between any two points on the circle. It is a special
case of a chord, namely the longest chord, and it
is twice the radius.
and which passes through the centre; or the length
of such a line segment, which is the largest distance
between any two points on the circle. It is a special
case of a chord, namely the longest chord, and it
is twice the radius.
 
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