Multiple choice

The height of a cone is 21 cm. and radius of its base is 28 cm. Find its curved surface area?

  1. 3018 cm2

  2. 4028 cm2

  3. 3034 cm2

  4. 5052 cm2

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Curved surface area of cone = πrl. First find slant height l = √(r² + h²) = √(28² + 21²) = √(784 + 441) = √1225 = 35 cm. Then CSA = π × 28 × 35 = 3080 cm² (using π = 22/7). Since 3080 is not in options, 'None of these' is correct.

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