The radius of a circle is the length of the line from the center of the circle to any point on its edge.
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The diameter of any circle is twice its radius
The length of a radius of a circle is half of the diameter of the same circle. So, diameter is always twice the radius.
diameter = 2 X radius
the radius is half the diameter. radius is half of 11. Which is 5.5.
The diameter of a circle is twice its radius.