The radius of a circle with centre at O is 6 cm and the central angle of a sector is 40°. Find the area of the sector.

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SSC CGL 2022 Tier-I Official Paper (Held On : 08 Dec 2022 Shift 4)
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  1. 6πcm2 
  2. 5πcm2
  3. 4πcm2
  4. 8πcm2

Answer (Detailed Solution Below)

Option 3 : 4πcm2
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Detailed Solution

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Given:

Radius of the circle = 6 cm

Central angle of a sector = 40°

Screenshot 2023-02-22 195223

Formula used:

Area of sector = \(\theta \over 360°\) × πr2

Calculation:

Area of the given sector =  \(40° \over 360°\) × π × (6 cm)2 

⇒ (\(1 \over 9\)× π × 36) cm2

⇒ (π × 4) cm2

⇒ 4π cm

∴ The area of the sector is 4πcm.    

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