Q4. In a temple there are 25 cylindrical pillars. The radius of each pillar is 28 cm and height 4 m. Find the total cost of painting the curved surface area of pillars at the rate of Rs. 8 per m².
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Rough Notes :
25 cylindrical pillars
Radius - 28 cm
Height - 4 m
Need to paint curved surface area of 25 pillars
Cost to paint 1 m - Rs. 8
Step-by-step Explanation :
Curved surface area of 1 cylindrical pillar = 4 m x 28 cm
= 400 cm x 28 cm
= 11,200 cm
Curved surface area of 25 cylindrical pillars = 11,200 x 25 cm
= 2,80,000 cm
= 2,800 m
Cost to paint 1 m of pillar = Rs. 8
Therefore, Cost to paint 2,800 m of pillars = 8 x 2,800
= Rs. 22,400
Answer :
Total cost of painting the curved surface area of the pillars at the rate of Rs. 8 per m² is Rs. 22,400
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