A rectangular piece of iron sheet measuring 50cm by 100cm is rolled into cylinder of height 50cm. If the cost of a
painting the cylinder is Rs 50 per square metre, then what will be the cost of painting the outer surface of the cylinder?
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Step-by-step explanation:
2πr=100
r=1/2π meter
to paint outer surface =2πrh
=2π*1*50*50/2π
=2500
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