If the curve is part of the circumference of the circle, it is called an arc.
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An arc is part of the circumference of a circle
Only round the perimeter of the circle (not across its interior) because a segment is a part of a line or curve between two points.
cicle or semi circle
A circle is a 360º curve. A 25º curve means that the two radius lines which give the start and end of the curve are 25 degrees apart (even if they are not 'visible' in the curve).
A geometrical curve is defined as any set of points. Therefore, counter-intuitively, a straight line is also a geometrical curve.