A piece of the circumference of a circle is called an arc
A piece of the area of a circle bounded by an arc and two radii is called A sector.
A piece of the area of a circle bounded by an arc and a chord is called a segment
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the interior of a circle is called a cabret
A chord of a circle that contains the center of the circle is called the diameter.
A line segment with its endpoints on the circumference (curve) of a circle is called a chord of that circle. If it passes through the center of the circle (which it can, but does not have to do), it is called a diameter of the circle. See the links below for more information.Is called a radius.
is called the diameter.
A line from the center of a circle to any point on the circle is called a radius.