Q. 204.7( 3 Votes )

A hollow cylindri

Answer :

Given ; inner circumference = 2πr1 = 44

r1 = 7dm


outer circumference = 2πr2 = 45


r2 = 7.16dm


height (h) = 3.5m = 35 dm


Total area of painting pipe = inner curved surface area + outer curved surface area of cylinder


= 2π r1h + 2π r2h


= 2π h(r1 + r2)



= 22 × 14.16


= 311.52 dm2


As, cost of 1 dm2 = Rs 2


So, cost of 311.52 dm2 = Rs(2 × 311.52) = Rs. 623.04


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