Circumference.
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It is the name given to the straight line from the centre of a circle to its circumference when that distance is 28 cm.
It is the name given to the straight line from the centre of a circle to its circumference when that distance is 36 inches.
That's a radius of the circle.
another name for a half circle is semi-circle
There is no name given to it. (As the number of sides increases, the upper limit of a regular polygon is a circle.)