Multiple choice

The radius of the base of a cylinder is 20 cm and the height is 12 cm. Find the surface area of the cylinder. (Assume $\displaystyle \pi =3.14$).

  1. $\displaystyle 4019.2{ cm }^{ 3 }$
  2. $\displaystyle 4019.2cm$
  3. $\displaystyle 4019.2{ cm }^{ 2 }$
  4. $\displaystyle 4018.6{ cm }^{ 2 }$
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C Correct answer
Explanation

Surface area of a cylinder = 2 * pi * r * (r + h) = 2 * 3.14 * 20 * (20 + 12) = 125.6 * 32 = 4019.2 cm^2.

AI explanation

Using the total surface area of a cylinder formula, 2 * pi * r * (h + r), we substitute the radius of 20 cm and height of 12 cm. This yields 2 * 3.14 * 20 * (12 + 20), which equals 4019.2 square cm.

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