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Multiple choice

The area of metal sheet required to make a closed hollow cone of height 24 m and base radius 7 m is

  1. 154 m2

  2. 352 m2

  3. 704 m2

  4. 550 m2

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The surface area of a closed cone is pi*r*(r + l), where l is the slant height. Given r=7 and h=24, l = sqrt(7^2 + 24^2) = sqrt(49 + 576) = 25. Area = (22/7) * 7 * (7 + 25) = 22 * 32 = 704.

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