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The interior of a building is in the form of a cylinder of base radius $12$ m and height $3.5$ m surmounted by a cone of equal base and slant height $14$ m. Find the internal curved surface area of the building.
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Internal CSA of the building = $$\begin{aligned}& 2 \times \frac{22}{7} \times 12 \times 3.5 + \frac{22}{7} \times 12 \times 14 \\ & = 792\end{aligned}$$ m$^2$