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Diameter is the length of two ends of a circle

Chord is the length of two points of a circle

Radius is the length of a point from the circle to the center

Center is the point which is equidistant to every point on the circle

Arc is part of the circle which is created by two lines coming from the center to two points on the circle
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Diameter-any straight line segment that passes through the center of the circle.
chord-geometric line segment whose endpoints both lie on the circle.
radius-is the length of the line from the center to any point on its edge
center-is a point inside the circle and is at an equal distance from all of the points on its circumference
arc-portion of the circumference of a circle
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