Question

there are 24 cylindrical pillars .Radius of each pillars is 28 cm and height is 4 m.Find the cost of painting curve surface area at the rate of Rs.8 per m2

Answer 1

Answer:

1351.68 Rs

Step-by-step explanation:

Step 1 : we have cost in $m^{2}$ so we will convert all value in m from cm

r = 28 cm = 0.28 m

h = 4 m

Step 2 : formula for surface area,

S.A. = $2\pi rh$

Step 3 : putting value in this formula,

S.A. for 24 cylinder = 24 x $2\pi rh$

= 24 * 2 * 22/7 * 0.28 * 4

= 24 * 2 * 22 * 0.04 * 4

= 168.96 $m^{2}$

Step 4 : now cost for $m^{2}$ is 8 Rs.

so total cast will be 168.96 * 8 = 1351.68 Rs.

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