Chapter 10 - Circles - Important Terms You Should Know
1. A
circle is a collection (set) of all those points in a plane, each one of which is at a constant distance from a fixed point in the plane.
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.