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For that same cylinder, the area of the lateral development is about

  • A.22 000 mm\( ^2 \)
  • B.7000 mm\( ^2 \)
  • C.3850 mm\( ^2 \)
  • D.31 400 mm\( ^2 \)

Answer: A

Correct answer: 22 000 mm2

\[ 220 \times 100 = 22{,}000\ \mathrm{mm^2}. \] The lateral area of a cylinder is simply the circumference times the height, which is exactly what the development makes visible - the curved surface laid flat is a plain rectangle.

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