The diameter and height of a cylindrical chimney are $2 m$ and $14 m$ respectively. Find the cost of painting its exterior curved surface at the rate of Rs. $150$ per $m^{2}$ .

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Solution

Given, $d = 2 m$ and $h = 14 m$ .
Cost of painting $=$ Rs. $150 / m^{2}$
$∴$ exterior curved surface area of chimney $= (2 π r) h = (π d) h = \frac{22}{7}$ $\times 2 \times 14 = 88 m^{2}$
$∴$ cost of painting $=$ Rs. $88 \times 150 =$ Rs. $13, 200$

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The diameter and height of a cylindrical chimney are 2 m and 14 m respectively. Find the cost of painting its exterior curved surface at the rate of Rs. 150 per m2.

Given, d=2 m and h=14 m.Cost of painting =Rs. 150 /m2∴ exterior curved surface area of chimney=(2πr)h=(πd)h=227 ×2×14=88 m2∴cost of painting = Rs.88×150= Rs.13,200

The diameter and height of a cylindrical chimney are $2 m$ and $14 m$ respectively. Find the cost of painting its exterior curved surface at the rate of Rs. $150$ per $m^{2}$ .

Given, $d = 2 m$ and $h = 14 m$ .
Cost of painting $=$ Rs. $150 / m^{2}$
$∴$ exterior curved surface area of chimney $= (2 π r) h = (π d) h = \frac{22}{7}$ $\times 2 \times 14 = 88 m^{2}$
$∴$ cost of painting $=$ Rs. $88 \times 150 =$ Rs. $13, 200$