Multiple choice

The curved surface area of a right circular cone of height 35 cm is , four times of the area of its base, then find the volume of the cone? (Approx)

  1. 2626

  2. 3384

  3. 2994

  4. 3316
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For a cone with height h=35 cm, CSA = πrl. Given: πrl = 4×πr² (base area). So l = 4r. Using l² = r² + h²: (4r)² = r² + 35². 16r² = r² + 1225. 15r² = 1225. r² = 81.67, r ≈ 9.04 cm. Volume = (1/3)πr²h = (1/3)×π×81.67×35 ≈ 2994 cm³ (approx).

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