In a building there are 25 cylindrical pillars. The radius of each pillar is 28cm and
height is 4m. Find the total cost of painting the pillars at the rate of ₹ 8 per m2
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Answer:
We have,
r= radius of cylindrical pillar =28 cm=
100
28
m
h= height of cylindrical pillar =4 m
∴ curved surface area of a cylindrical pillar = 2πrh=2×
7
22
×
100
28
×4cm
2
∴ Curved surface area of 25 pillar = 2×
7
22
×
100
28
×4×25m
2
=176m
2
Hence, total cost of painting at the rate of Rs 8 per m
2
=Rs(176×8)=Rs 1408
Step-by-step explanation:
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