Question

A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface of the pillar at the rate of Rs. 12.50 per m

Answer 1

Answer:

refer the attachment...

hope it helps

Answer 2

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$\sf{Radius = \frac{diameter}{2} = \frac{50}{2} = 25cm}$

1m=100cm

25cm=0.25m

So radius=0.25m

Height=3.5m

${\boxed{\sf {\red {C.S.A.}}}}\\ \boxed {\sf{lateral \: surface \: area + area \: of \: cylinder}}$

$\sf \: = 2πrh+2π{r}^{2}$

$\sf C.S.A. = (2 \times \frac{22}{7} \times 0.25 \times 3.5) + (2 \times \frac{22}{7} \times 0.25 \times 0.25 )$

=5.5+0.39=5.89m²

Cost of painting 1 m²=₹12.50

Cost painting 5.89m²=12.50×5.89=₹72.62

Hope it helps you.....