Question

A cylindrical pillar is 40cm in diameter and 3.5 m in height. find the cost of painting the curved surface area of the pillar at the rate of Rs. 13.50 pet sq.m​

Answer 1

Step-by-step explanation:

Given:

H=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