Question

find the cost of painting a cylindrical cement tank of height 100cm. inner and outer radius 0.77cm and 0.70cm at the rate of 2.5 per cm^2

Answer 1

hope it is helpful for you

Answer 2

in cylinder

height=100cm
inner radius=0.77cm =r1
outer radius=0.70=r2

area =πh(r1-r2)
=22/7×100(0.77-0.70)
=2200/7×0.07
=22cm2

now, cost of painting=2.5 per cm2
22cm2 =22×2.5

now , cost of painting=₹55.0


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