Question

In a building there are 24 cylindrical pillars the radius of each pillar is 28 cm and height is 4 m find the total cost of painting the curved surface area of all pillar at the cost Rs 8 per m^2

Answer 1

Hey there!

The radius of one pillar is 28cm, and the height is 4m.

The painting is to be done on the Curved Surface, hence we need to find the CSA of one pillar, and multiply it with 24.

$CSA = 2\pi rh$

$CSA = 2 \times \frac{22}{7} \times \frac{28}{100} \times 4$

$CSA = 8 \times \frac{22}{7} \times \frac{28}{100}$

$CSA = 8 \times 22 \times \frac{4}{100}$

$CSA = \dfrac{32 \times 22}{100}$

$CSA = \frac{704}{100}$

$CSA = 7.04 m^{2}$

Now that we know the CSA of one pillar, we can multiply it with 24 to get the total area to paint.

$= 7.04 \times 24$

$= 168.96 m^{2}$

The cost is Rs. 8 per m². So, we can multiply the total area with 8, to get the final cost.

$Final = 8 \times 168.96$

$Final = Rs. 1351.68$

Therefore, the total cost of painting the 24 pillars is Rs. 1351.68.

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Answer 2

$\huge\bf{Answer:-}$

Yes

Explanation

Refer the attachment.