Question

The diameter of a cylinderical pillar is 50 cm and height is 3.5 m. find the cost of
painting of the pillar if its rate is Rs. 12.50 per sq. meter.​

Answer 1

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Given radius of cylinder

= D/2

=50/2

=25 cm

=0.25 m

Height of cylinder =3.5 m

CSA of cylinder

= 2πrh

=2π(0.25×3.5)

CSA of cylinder 

=5.5 m2

cost of painting per meter square 

=12.50 RS

Total cost of painting 

=12.50×5.5

=68.75 RS.