Diameter: A straight line dividing the circle equally
Circumference: The distance around the circle
Radius: The middle of a circle reaching to one point of the circle
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A central angle.The section of the circle formed by that angle and the part of the circle (the part being the circumference) between the radii is called a sector.
sector
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the interior of a circle is called a cabret
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