Multiple choice

If the diameter of a cylinder is $28\,cm$ and it height is $20\,cm$, then its curved surface area is

  1. $820\,{cm}^{2}$
  2. $1760\,{cm}^{2}$
  3. $3520\,{cm}^{2}$
  4. $2460\,{cm}^{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Curved surface area = 2 * pi * r * h. Diameter = 28, so r = 14. h = 20. CSA = 2 * (22/7) * 14 * 20 = 2 * 22 * 2 * 20 = 1760.

AI explanation

The curved surface area formula is pi times diameter times height. With a diameter of 28 centimeters and height of 20 centimeters, the calculation is 22 divided by 7 times 28 times 20. This multiplies out to 88 times 20, giving 1760 square centimeters.

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