Question

A tent is in shape of right circular cylinder up to a height of 3m and a cone above it. The

maximum height of tent above ground is 13.5m. Calculate the cost of painting the inner side

of tent at rate of Rs. 3/sq m if radius of base is 14m.​

Answer 1

Step-by-step explanation:

Radius of base of cylindrical portion=14m

Height of cylindrical portion=3m

Curved surface area of cylindrical part=2×

7

22

×14×3

Height of conical part=13.5−3=10.5m

For conical part:r=14m,h=10.5m

l=

(14)

2

+(10.5)

2

=

306.25

l=17.5m

CSA of conical part=πrl=

7

22

×14×17.5=770㎡

∴Total area to be painted=(264+770)㎡=1034㎡

Cost of painting=Rs. (1034×2)=Rs. 2068

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