# A tent is of the shape of a right circular cylinder up to a height of 3 m and then becomes a right circular cone with a maximum height of 13.5 m above the ground. Calculate the cost of painting the inner side of the tent at the rate of Rs 2 per square metre, if the radius of the base is 14 m.

Given: Height of cylinder “h” = 3 m

Height of tent “H” = 13.5 m

Cost of painting = Rs 2 per m2

Formula Used:

Curved surface area of cylinder = 2πrh

Curved surface area of cone = πrl

Explanation: We have, r = 14 m

h = 3 m

CSA of cylinder = 2πrh = 264 m2

The height of the cone = Height of tent – height of cylinder

= 13.5 – 3

= 10.5 m

Now slant height of the cone is Where r = 14 m and h = 10.5 m    We have shown, how to take square-root l = 17.5 m

So CSA of cone = π r l = 770 m2

Total area to be painted = CSA of the cylinder + CSA of the cone

= 264 m2 + 770 m2

= 1034 m2

Cost of painting 1 m2 = Rs 2

Cost of painting 1034 m2 = Rs 2 × 1034

= Rs 2068

Hence cost of painting the tent is Rs 2068.

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