Madhya Pradesh Police Exam Model Paper 4

Given:
Total number of pillars = 24
The radius of the pillar = 28 cm = 0.28 m
Height of the pillar = 4 m
Formula used:
The curved surface area of the cylinder $=2\mathit{\pi }\mathit{r}\mathit{h}$
Here, r and h are the radius and height of the cylinder respectivelyCalculation:
The curved surface area of the one cylindrical pillar $=2\mathit{\pi }\mathit{r}\mathit{h}$
$\Rightarrow 2\times 22/7\times 0.28\times 4$
$\Rightarrow 176/25{\mathit{m}}^2$
The curved surface area of the 24 pillars $=\left(176\times 24\right)/25$
$\Rightarrow 4224/25{\mathit{m}}^2$
The cost of painting the pillar $=4224/25\times 25=\mathit{R}\mathit{s}4224$
∴ The cost of painting the cylindrical pillar is Rs 4224