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Ganit Mantra Series : Circles-1 ( An introduction )A  circle is the locus of a point in a plane which moves in such a way that  its distance from a fixed point is always constant. The fixed point is called the centre of the circle while the fixed distance is called the radius of the circle. Let C be  the centre of the circle and the radius by r. For any point P(x, y) lying on the circle, the length PC must be equal to r. 

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