Multiple choice

The height of a cone is 42 cm and diameter is 13 cm. Find the approximate curved surface area of cone?

  1. 868 cm2

  2. 850 cm2

  3. 890 cm2

  4. 880 cm2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For a cone with height h = 42 cm and diameter d = 13 cm (radius r = 6.5 cm). Curved surface area = πrl, where l = √(h² + r²) = √(42² + 6.5²) = √(1764 + 42.25) = √1806.25 ≈ 42.5 cm. CSA = π × 6.5 × 42.5 ≈ 3.14 × 6.5 × 42.5 ≈ 868 cm². Option A (868) is the approximate curved surface area.

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