Question

the outer diameter of a gas cylinder is 20 cm find the cost of painting its outer curved surface at rupees 4 per CM if the height of the cylinder is 70 cm ..

Answer 1

if diameter is 20cm
so,radius is 10 cm
and height is 70 cm
now CSA of cylinder =2πrh
=2×22/7×10×70
=44×100
area =4400cm^2
as we know ,
cost =price × area
=4 × 4400 =17600rs.
cost for painting outer CSA is Rs. 17600
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