Radius - a straight line from the centre to the circumference of a circle or sphere, Diameter - a straight line passing from side to side through the centre of a body or figure, especially a circle or sphere., Circumference - the distance around the outside of a circle. Pi x Diameter , Arc - a part of a curve, especially a part of the circumference of a circle., Chord - the line segment joining any two points on the circumference of the circle, Segment - the region that is bounded by an arc and a chord of the circle, Sector  - a geometric figure bounded by two radii and the included arc of a circle.,

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