Diameter: A line segment that passes through the center, radius plus a radius, a special chord that passes through the center, radius times 2, , Radius: half of the diameter, a line segment connecting the center to the circumference, divide the diameter by 2, , Chord: any line that passes through a circle, a line segment that passes through a circle below the center, , Circumference: length around a circle, perimeter around a circle, ,

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