Question

13. A closed cylindrical water tank having 7 m radius and 3 m height is constructed on land. Find the cost of painting it at the rate of 10 per m²

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Answer 1

Total Surface Area of cylindrical water tank=

$= 2\pi \: r(h + r)$

r = 7m, h = 3m

$= 2\pi(7)(7 + 3)$

$=2\pi(7)(10)$

$= 140\pi$

$= 439.88 {m}^{2}$

Rate of painting 1m^2 = Rs. 10

Rate of painting 439.88m^2 =

$= 439.88 \times 10$

$= rs \: 4398.8$

Cost of painting will be Rs. 4398.8

Answer 2

Step-by-step explanation:

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