Question

The outer diameter of a gas cylinder is 20 cm. Find the cost of the painting of his
outer curved surface at? 4 per square centimetre ii the height of the cylinder is
70 cm,​

Answer 1

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✔given that :

outer diameter: 20cm

radius : 10 cm

height of the cylinder: 70 cm.

✔to find :

cost of painting of outer surface

✔solution :

$curved \: surface \: area = 2\pi \gamma h$

$2 \times \frac{22}{7} = 10 \times 70$

while cutting both 7 and 70 and multiplying , we got

$= 4400c {m}^{2}$

$= rs4 \times 4400 = 17600$

therefore cost of painting = 17600.

Answer 2

Step-by-step explanation:

CSA of cylindrical gas = 2πrh

= 2×22/7×20/2×70

=4400 cm^2

cost of painting =4400×4 =Rs17600