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- A circle is a round closed, geometrical figure.
- It is a two dimensional curved figure.
- It has no corners or vertices.
- The points of the circle are at a fixed distance from the center.
- The fixed point is called the center of the circle.
- It is derived from the Greek word kirkos, meaning ring.
- A straight line passing through the center with endpoints on a circle is called diameter.
- The half of diameter is called radius.
- The line enclosing the circle is called its circumference.
- A circle divides the plane into two parts: interior and exterior.
