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line segment
it is a line segment.
It is a chord or the diameter of a circle
Only one endpoint? if two, it's a diameter...
No.
If it connects the center of the circle to the edge, it is the radius. If it is a straight line that connects the edges of a circle through the center, it is the diameter.
line segment
it is a line segment.
diameter
It is a chord or the diameter of a circle
Only one endpoint? if two, it's a diameter...
No.
it is the diameter
if you have the diameter or the arc, then you can divide the diameter by two, or you can use the arc to calculate it.
If you have only the arc length then you cannot find the diameter.
The answer depends on what information you have been given.
A radius is half of the diameter of a circle, or the distance from one endpoint to the center.