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**Circle :** A circle is the locus of a point which moves in a plane in such a way that its distance from a fixed point always remains same. The fixed point is called the centre and the given constant distance is known as the radius of the circle.

If *r* is the radius of a circle, then

(i) Circumference = 2πr or πd ,

where *d* = 2*r* is the diameter of the circle.

(ii)

(iii) Area of semi circle

(iv) Area of quadrant of a circle

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