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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.​

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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