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Radius- A segment from the center of the circle to a point on the circle(the distance from the center to a point on the circle.) Circumference – distance around the edge of the circle Congruent Circles- two circles with the same radius. Diameter – A segment that goes through the center of the circle, with both endpoints on the edge of the circle. Chord - A line segment that goes from one point to another on the circle's circumference.Inscribed Angle - an angle made from points sitting on the circle's edge.Central angle- an angle with vertex at the center of the circle

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