in a building there r 24 cylindrical pillars the radius of each pillar is 28 cm and height is 4m .find the total cost os painting the curved surface area of all pillars at the rate of rs 8 per m²
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Answer:
C.S.A. of cylindrical =2πrh
⇒ C.S.A. of are pillar =2×
7
22
×28×4=704cm
2
⇒ C.S.A. of 24 pillars =24×704=16896cm
2
=16896×10
−4
m
2
=1.69m
2
⇒ Total cost Rs. 8×1.69=Rs.13.52
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