Question

Cross sectional diameter and length of a hume pipe are 1400 mm and 2500 mm
respectively. Find the cost of painting exterior side of 22 such pipes at the rate of
Rs. 8 per square metre​

Answer 1

$\sf\Large\red{\underbrace{Answer \implies Rs.\:1936.00}}$

$\sf{\underline{\underline{Given:}}}$

$\sf{\longrightarrow Diameter\:of\:pipe = 1400\:mm = 1.4\:meters}$

$\sf{\longrightarrow So,\: Radius\:(R) = \dfrac{1.4}{2} = 0.7\:meters}$

$\sf{\longrightarrow Length\:of\:pipe\:(L) = 2500\:mm = 2.5\:meters}$

$\sf{\underline{\underline{Therefore:}}}$

$\sf{Exterior\:area\:of\:the\:cylindrical\:surface = 2\:pie\:R\:L}$

$\sf\purple{\implies 2 \times \dfrac{22}{7} \times 0.7 \times 2.5}$

$\sf\orange{\implies 11\:{m}^{2}}$

$\sf{\underline{\underline{Now,}}}$

$\sf{Cost\:of\:painting\:22\:pipes\:at\:Rs.\:8.00\:{m}^{2}}$

$\sf\red{ \: \: \: \: \:= 11 \times 22 \times 8}$

$\sf\green{ \: \: \: \: \:= Rs.\:1936.00}$

$\sf{\underline{\underline{Hence,}}}$

$\bold{\fbox{\color{red}{Cost\:of\:Painting = Rs.\:1936.00}}}$

Answer 2

Answer:

the above pic is the answer