It is the circle's circumference
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circumference
The radius of a circle is the distance from the center of the circle to the outer edge Also known as half of the diameter. The diameter is the distance from opposite edges of the circle going through the centre.
No, it cannot. A chord of a circle is a line segmentwhich has its endpoints on the curve (or circumference) of the circle. A line segment is part of a line, and a line is straight. It's that simple.
200m radius describes a circle which from it's outer edge to it's center is 200 meters. The circle itself, therefore, would be 400 meters across.
The measure from the center of a circle to its edge is the radius.