Multiple choice

The diameter of the base of a right circular cylinder is $28$ cm and its height is $21$ cm Curved surface area of the cylinder is

  1. $1540$ $\displaystyle cm^{2}$
  2. $1648$ $\displaystyle cm^{2}$
  3. $1848$ $\displaystyle cm^{2}$
  4. $1548$ $\displaystyle cm^{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Radius r = 14 cm, height h = 21 cm. Curved surface area = 2 * pi * r * h = 2 * (22/7) * 14 * 21 = 2 * 22 * 2 * 21 = 1848.

AI explanation

The radius is half of the diameter, so r = 14 cm. Using the curved surface area formula for a cylinder, 2 * pi * r * h, we substitute the values to get 2 * 22/7 * 14 * 21. This simplifies to 2 * 22 * 2 * 21, which equals 1848 cm^2.

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