Multiple choice

Base area of circular cylinder is $154\ {cm}^{2}$. Then its radius is

  1. $14\ cm$
  2. $21\ cm$
  3. $7\ cm$
  4. $10.5\ cm$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Base area = pi * r^2 = 154. r^2 = 154 / (22/7) = 154 * 7 / 22 = 7 * 7 = 49. r = 7.

AI explanation

The base area of a circular cylinder is pi * r^2. Setting this equal to 154, we get r^2 = 154 / (22/7), which simplifies to r^2 = 49. Taking the positive square root, the radius is 7 cm.

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