Question

The cylindrical pillar is 50cm in diameter and 3.5m in height. Find the cost of whitewashing the curved surface at the rate of Rs. 1.25 per sq. m.

Answer 1

Answer:

you need rupees 50

Step-by-step explanation:

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Answer 2

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