find the cost of painting 15 cylindrical pillars of a building at rupees 2.50per square metre if the diameter and height if each pillar are 48 cm and 7 metres respectively.
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It is given in the question that, Diameter of the cylindrical pillars = 48 cm Hence, The radius of the cylindrical pillars = 48 2 = 24 cm = 0.24 m Height of the cylindrical pillars = 7 m Now, Lateral surface area of one pillar = πdh = 22 7 ×0.48×7 = 10.56 m2 Now, The surface area to be painted = total surface area of 15 pillars = 15 × 10.56 = 158.4 m2 Therefore,
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