Chapter 10 - Circles - Important Terms You Should Know
2. The fixed point is called the centre and the constant distance is called the radius of the circle.
3. All the points lying inside a circle are called its interior points and all those points which lie outside the circle are called its exterior points.
4. The collection (set) of all interior points of a circle is called the interior of the circle while the collection of all exterior points of a circle is called the exterior of the circle.
5. A line segment joining two points on a circle is called the chord of the circle.