Question

# $$25$$ circular plates, each of radius $$10.5\ cm$$ and thickness $$1.6\ cm$$, are placed on above the other form of solid circular cylinder. Find the curved surface area and the volume of the cylindrical so formed.

Solution

## 25 circular platesRadius of plate = 10.5 cmthickness  = 1.6 cmcurved surface Area = (?)volume of cylinder = (?)$$\rightarrow$$ Height of the cylinder $$= no.\, of\, plates \times \,thickness$$$$= 25 \times 1.6$$$$= 40 cm$$$$\rightarrow$$ curved surface Area $$= 2\pi r.h$$$$= 2\pi \times 10.5\times 40$$$$= 2,640\,cm^{2}$$$$\rightarrow$$ volume of the cylinder $$= \pi r^{2}.h$$$$= \pi \times (10.5)^{2}\times 40$$$$= 13.860 \,cm^{3}$$Mathematics

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