Question

a cylindrical pillar whose diameter is 50 cm and height is 5 m has to be painted. find its surface area and cost of painting it at the rate of rs 150 per/m²​

Answer 1

Answer:

=3.5 m, R=

2

50

=25 cm =

100

25

=0.25 m

⇒CSA=2πrh=(2×

7

22

×0.25×3.5) m

2

=5.5 m

2

⇒Cost of painting 1 m

2

area = Rs.12.50

⇒Cost of painting 5.5 m

2

area

= Rs.5.5×12.50

= Rs.68.75