Q3. A building has 14 cylindrical pillars, each of diameter 1m and height 4.5 m. The curved surface of all the pillars have to be painted leaving 15 cm from top and bottom. Find the cost of painting the pillars at the rate of Rs. 25 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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