A semicircle.
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It is a semicircular arc.
It is called a semicircle.
If you have only the arc length then you cannot find the diameter.
Semi-circle.
I believe that is called a chord. Yes, a chord is the straight line segment that crosses a circle, from one side of the circle to the other. The biggest possible chord is the diameter. The curved part of the circle, cut off by the chord [or chords], is the arc or the angle.