Question

In a building there are 24 cylindrical pillars.The diameter of each pillar is 56cm and height is 4m.Find

the total cost of painting the curved surface area of all the pillars at the rate of Rs. 15 per sq meter ​

Answer 1

Answer:

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Answer 2

Answer:

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$dimeter \: of \: each \: pillar = 56cm \\ \boxed{r = \frac{d}{2} } \\\longrightarrow \: radius \: r = \frac{56}{2} \: \: \: \: \: = 28cm \: \: \: \: \\ hight \: of \: each \: pillar = 4m \: \: \: \: \: \: \: \\ \boxed{1m = 100cm} \\ \longrightarrow \: hight \: h = 4 \times 100 = 400cm \\ \boxed{c.s.a \: of \: cylinder =2\pi rh } \\ so \: csa \: of \: each \: pillar = 2\pi(28 \times 400) \\ so \: csa \: of \: 24 \: pillar = 24(2\pi(28 \times 400)) \\ cost \: of \: painting = 15rs \: per \: {m}^{2}$