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  1. A right circular cylindrical tunnel of diameter 5m and length 10m is to be constructed from a sheet of iron. The area of iron sheet required will be :
    1. 52π
    2. 50π
    3. 51π
    4. 49π
Correct Option: B

Surcface area of cylindrical tunnel = 2πrh

= 2 × π ×
5
 × 10sq.metre
2

= 50π sq.m.


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