Multiple choice

The curved surface area of a frustum having slant height 7 cm and the base radii 4 cm and 3 cm is

  1. 164 cm2

  2. 254 cm2

  3. 168 cm2

  4. 154 cm2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The curved surface area of a frustum is pi * (r1 + r2) * l. Using pi = 22/7, r1 = 4, r2 = 3, and l = 7, we get (22/7) * (4 + 3) * 7 = 22 * 7 = 154 cm^2.

AI explanation

The curved surface area of a frustum of a cone equals pi times the sum of the base radii times the slant height. Substituting the values gives pi times (4 plus 3) times 7. Using pi as 22 divided by 7, the product of 22 divided by 7, 7 and 7 is 154. The result is 154 cm2.

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