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Question

A cylindrical tank 7km in diameter, contains water to a depth of 4m. Find the total area of the wet surface (π=3.14)

A
46.5m2
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B
126.5m2
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C
166.5m2
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D
106.5m2
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Solution

The correct option is B 126.5m2
Wet\ surface = curved surface upto water level + bottom circle
Radius of the cylinder r=72m
Height of the cylinder h=4m

Area of wetted surface = Curved surface area of the cylinder + Area of base circle
=2πrh+πr2
=πr(2h+r)

=227×72(8+3.5)

=11×11.5
=126.5 m2

Hence, this is the answer.

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