A) \[52\,\pi \] square metre
B) \[50\,\pi \] square metre
C) \[51\,\pi \] square metre
D) \[49\,\pi \] square metre
Correct Answer: B
Solution :
Surface area of cylindrical tunnel \[=2\pi rh\] \[=\left( 2\times \pi \times \frac{5}{2}\times 10 \right)\,sq.\,m.=50\pi \,sq.\,m.\]You need to login to perform this action.
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