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A right circular cylindrical tunnel of diameter 4m and length 10m is to be constructed from a sheet of iron . The area of the iron sheet required is




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Diameter = 4m
radius = 2m
length = 10m
CSA = 2πrh = 2×π×2×10 = 125.7 m²
1 4 1
so.....R=2 m
and l=h=10m
area of total sheet required=curved surface area of cylinder
area=125.6 m²

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