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Multiple choice

A right circular cone of radius $4$ cm and slant height $5$ cm is carved out from a cylindrical piece of wood of same radius and height $5$ cm. Find the surface area of the remaining wood.

  1. $36 \pi cm^2$
  2. $84 \pi cm^2$
  3. $34 \pi cm^2$
  4. None of these

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