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**What we already learned in previous classes**

**Perimeter and Area of a circle**

**Area enclosed by two concentric circles**

**Some Useful Results**

**Minor and major sector**

**Area of a sector**

**Find the area of a sector whose radius is 14 cm and angle of sector is `45^@`.**

**Some important points related to clock**

**Major and Minor segment**

**Area of a segment**