Find the cost of painting the curved surface of ten
cylindrical containers of radius 20 cm and height
50 cm at 125 per sq. m.
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Answer:
CSA of a cylinder = 2πrh
CSA of 10 cylinders= 10×2πrh
=20πrh
r=20cm=0.2m
h=50cm=0.5m
CSA=20\times\frac{22}{7}\times0.2\times0.520×
7
22
×0.2×0.5
=6.28m²(Approx.)
1m²=₹125
6.28m²= 125×6.28
\huge\boxed{\blue{₹785}}
₹785
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