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Answer :
Surface area of the article when it is ready = Curved surface area of cylinder + 2 × Curved surface area of hemisphere.
\( = \ 2 \pi rh \ + \ 2 \ × \ 2 \pi r^2 \ = \ 2 \pi r(h \ + \ 2r) \)
where r = 3.5 m and h = 10 cm
\( = \ 2 \ × \ \frac{22}{7} \ × \ 3.5 \ × \ (10 \ + \ 2 \ × \ 3.5) \)
\(= \ 2 \ × \ \frac{22}{7} \ × \ 3.5 \ × \ 17 \ = \ 374 \) cm2