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**Circle
**

A circle is a closed figure each of whose points is equidistant from a fixed point inside it. The fixed point is called the center of the circle.

The distance between the center and any point on it is called its radius.

represents a radius of the circle.

**Diameter**

A chord which passes through the center of the circle is called the diameter of the circle.

Half of a circle is called a semicircle.

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