If the slant height of a cone is 60 cm and the radius of its base is 21 cm, then find its curved surface area. (use π = )

This question was previously asked in
SSC CGL 2023 Tier-I Official Paper (Held On: 26 Jul 2023 Shift 1)
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  1. 3880 cm2
  2. 3820 cm2
  3. 3960 cm2
  4. 4020 cm2

Answer (Detailed Solution Below)

Option 3 : 3960 cm2
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PYST 1: SSC CGL - General Awareness (Held On : 20 April 2022 Shift 2)
25 Qs. 50 Marks 10 Mins

Detailed Solution

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Concept used:

The curved surface area of cone = π × r × l, where r = radius and l = slant height

Calculation:

The curved surface area of cone

⇒ π × r × l

 π × 21 × 60

⇒ 22/7 × 21 × 60

 ⇒ 3960 cm2

∴ The correct answer is 3960 cm2

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