Q. 134.0( 37 Votes )

Find the cost of painting 15 cylindrical pillars of a building at Rs. 2.50 per square metre if the diameter and height of each pillar are 48 cm and 7 metres respectively.

Answer :

It is given in the question that,

Diameter of the cylindrical pillars = 48 cm


Hence,


The radius of the cylindrical pillars =


= 24 cm


= 0.24 m


Height of the cylindrical pillars = 7 m


Now,


Lateral surface area of one pillar =


=


= 10.56 m2


Now,


The surface area to be painted = total surface area of 15 pillars


= 15 × 10.56


= 158.4 m2


Therefore,


The total cost of painting = Rs(158.4 × 2.5)


= Rs 396


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