10 cylindrical pillers of a building have to be painted if the diameter of each piller is 50cm and the the hight is 4m what will be the cost of painting at the rate of ruppes 40 per sq meter
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Step-by-step explanation:
Given : Diameter of the pillar = 50 cm, so the radius = 25 cm or 0.25 m
Height of the pillar = 4 m
Curved surface area of the pillar = 2*π*r*h
= 2 × 22/7 × 0.25 × 4
= 44/7
= 6.285 sq m
Curved surface area of one pillar = 6.285 sq m
The curved surface area of 10 pillars = 10 × 6.285 = 62.85 sq m
The cost of painting = Rs. 40 per sq m
Total cost of painting 10 pillars = 40 × 62.85
= Rs. 2514
Total cost of painting the 10 pillars is Rs. 2514
Answer.
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