The area of a sector of a circle is 308 cm2, with the central angle measuring 45°. The radius of the circle is:

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SSC CGL 2022 Tier-I Official Paper (Held On : 03 Dec 2022 Shift 4)
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  1. 14 cm
  2. 21 cm
  3. 7 cm
  4. 28 cm

Answer (Detailed Solution Below)

Option 4 : 28 cm
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SSC CGL Tier 1 2025 Full Test - 01
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Detailed Solution

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Given:

The area of a sector of a circle is 308 cm2

The angle of the sector is 45°

Concept used:

Area of a sector = πr2 × θ/360°

θ = angle of the sector

r = radius

Calculation:

According to the question,

 = 308

⇒ πr2 = 308 × 8

⇒ 22/7 × r2 = 2464

⇒ r2 = 784

⇒ r = 28cm

So, radius = 28 cm

∴ The radius of the circle is 28 cm.

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