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34. In a building there are 25 cylindrical pillars. The radius of each pillar is 50 cmand height 5 m. Find the cost of painting curved surface area of pillars at therate of * 70 per sq. m. |
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Answer» Answer: Rs 27500 Step-by-step EXPLANATION: Radius of 1 PILLAR = 50cm = 0.5 m CURVED surface of 1 pillar is 2πrh = 2 x (22/7) x (0.5) x 5 m² = 110/7 m² ∴ Curved surface area of 25 such pillars 25 x 110/7 m² = 2750/7 m² Cost of painting = rate x area = Rs 70 x (2750/7) = Rs 27500 |
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