Areas of Sector and Segment of a Circle :
We know that, the circular region enclosed by two radii and the corresponding arc is called 'a sector of the circle' and the circular region enclosed by the chord and corresponding arc is called a segment of the circle. There are two types of sector and segment each in a circle.

Major sector: It is the sector of a circle in which major arc is the part of its boundary. In the given fig.(i) OAMB is the major sector.
Minor sector : It is the sector of a circle in which minor arc is the part of its boundary. In the given fig. (i) OALB is the minor sector.
Minor segment: It is the segment of a circle in which minor arc is the part of its boundary. In the given fig.(ii) ALB is the minor segment.