7. The radius of the cylindrical box without top is 5.5 cm and height is 3 cm. What will be the
cost of wrapping the box from outside at the rate of 3.50 per cm?? (Take π as 22/7)
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Answer:-
Since V=πr
2
h, we must have π(r+x)
2
h=πr
2
(h+x).
∴x=(r
2
−2rh)/h.
For r=8 and h=3,
we have x=5
3
1