Chapter 12 : Area Related to Circle This chapter transitions from basic circle properties to calculating the areas of specific portions of a circular region, namely the Sector and the Segment. Key Points (Sector and Segment) Sector: The region enclosed by two radii and their corresponding arc. Minor Sector: The smaller portion (e.g., OAPB). Major Sector: The larger portion (e.g., OAQB). Segment: The region enclosed between a chord and its corresponding arc. Minor Segment: The smaller portion (e.g., APB). Major Segment: The larger portion (e.g., AQB). Core Formulas The chapter utilizes the Unitary Method based on a full circle's angle to derive these essential formulas: Practice Questions With Solution