There are 20 cylindrical pillars in a path. The radius of each pillar is 14cm and height 1 m. Find the cost of painting the curved surface of all pillars at the rate of Rs 10 sq m.

Class: 10

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Rs 176

Rs 200

Rs 100

Rs 300

answer is A.

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Detailed Solution

Given, radius of each pillar is 14 cm
height of each pillar is 1 m
No. of cylinder is 20
Curved surface area of cylinder = 2 π r h
Curved surface area =

2 \times 3.14 \times 0.14 \times 1 = 0.88 m^{2}

Curved surface area for 20 pillars=

20 \times 0.88 m^{2} = 17.6 m^{2}

Cost for painting 20 pillars =

10 \times 17.6 = Rs 176

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