* The set of all Points *P* having the same distance from the center *C* * A closed figure made up of all those points in a plane that are at the same distance from a fixed point
Circle
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* Point *C* is called * Also called **fixed point**
Center of the Circle
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Common distance from the Center
Radius
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A chord passing through the center of a circle
Diameter
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A line segment joining two points on a circle
Chord
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A line intersects two points on a curve
Secant Line
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* A line that touches a curve at a point * A line perpendicular to the center of a circle