culdesac
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I always called it an arc. It is simply a section of the circle. The ends are determined by the two radii you referenced. Each of the radii start at the center of the circle and end at their intersection with the circle. The portion of the circle that lies between the ends of the two radii is an arc.
The inside of a circle is called its area.
circle
Part of the circumference of a circle is called an arc.
It is the radius of the circle