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**Introduction**

**Circle is the set of all those points in a plane whose distance from a fixed point remains constant.**

**Diameter a line segment passing through the centre of a circle and having its endpoints on the circle is called a diameter of the circle.**

**Interior the part of the plane consisting of those points P for which `OP < r` is called the interior of the circle with centre O and radius r.**

**Exterior the part of the plane consisting of those points P for which `OP > r` is called the exterior of the circle with centre O and radius r.**

**Circle the part of the plane consisting of whose points P for which OP=r is the circle itself i.e. the set of all points lying on the circle is the circle itself.**

**Chord of a circle- A line segment with its end-points lying on a circle is called the chord of the circle.**

**Arc of a circle a continuous piece of a circle is called an arc of the circle.**

**Minor and major arcs**

**Secant of a circle**