Find the cost of painting 18 cylindrical pillars of building at `6 per sq.m., if the diameter and height of each pillar is 42 cm and 6 m respectively.
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Step-by-step explanation:
Diameter (d) = 42cm
Radius (r) = 42/2 = 21 cm = 21/100
= 0.21 m
Height (h) = 6 m
Curved Surface Area of cylinder
= 2πrh = 2×22/7×0.21×6
= 7.92 m2
Area of 18 pillars = 18×7.92
=142.56 m2
Cost of painting = ₹3.50×142.56
=₹498.96
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