1. Find the cost of painting 15 cylindrical pillars of a building at ₹ 2.50 per square metre if the diameter and the height of each pillar is 48 cm and 7 metres respectively.
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Area of cylindrical pillar= 2πrh+2πr²
=2*22/7*0.24*7+2*22/7*(0.24)²
=264/25 +1584/4375
=10.922m2
Cost of painting 1pillar=10.922*2.50
=27.31
Cost of 15 pillars= 27.31*15=rs.409.50
=2*22/7*0.24*7+2*22/7*(0.24)²
=264/25 +1584/4375
=10.922m2
Cost of painting 1pillar=10.922*2.50
=27.31
Cost of 15 pillars= 27.31*15=rs.409.50
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