Rashid has 2 circular lids of tin of radius 7inch each and a rectangular tin sheet to make a closed cylindrical tank of height 20inch. What should be the length and the breadth (approximately) of the regular tin sheet required to make the said tank? (a)44 inches and 20 inches (b)20 inches and 44 inches (c)20 inches and 20 inches (d) 44 inches and 44 inches.
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Answer:
Given:
Radius r=7m, height =3m
We need to find the total surface area of a cylinder
=2πr(r+h)
=2×
7
22
×7(7+3)=440 sq meter
So, 440 sq m sheet of metal is required
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