50 circular plates ,each of radius 7cm and thickness 0.5cm are placed one above the other to form a right circular cylinder. Find the total surface area of the cylinder.
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Answer:
50 circular plate
diameter of plate =14cm
Radius of plate = d/2=
2
14
=7cm
thickness =0.5cm
→ Height of the cylinder = No. of plates × thickness of plate
=50×0.5
=25cm
→ total surface Area = curved surface + 2 × area of base
=2πr.h+2×πr
2
=2πr(h+r)
=2π×7(25+7)
=2×
7
22
×7×32
=1408cm
2
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