A right circular cylindrical tunnel of diameter 5 m and length 10 m is to be constructed from a sheet of iron. The area of sheet required will be:
Radius = $$r=2.5$$ m and height = $$h=10$$ m
Surface area of cylinder = $$2\pi rh$$
= $$2\times\pi\times2.5\times10$$
= $$50\pi$$ $$m^2$$
=> Ans - (B)
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