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circular arc is a segment of the circumference of a circle
If the arc is circular, such a figure is a semicircle or half circle.
A radian measures the degree of the arc. For instance, π radians is 180°. Then, the arc with π radians measures 180°.
Circular segment
The radius of curvature of a circle, or an arc of a circle is the same as the radius of the circle.For a curve (other than a circle) the radius of curvature at a given point is obtained by finding a circular arc that best fits the curve around that point. The radius of that arc is the radius of curvature for the curve at that point.The radius of curvature for a straight line is infinite.