Question

The radius and the height of a cylindrical tank with lid are 28 cm and 1 m respectively. Find the cost of painting the outer surface of the cylindrical tank at the rate of Rs.1 per cm². (Neglect the area of the bottom.)

Answer 1

Answer:

Cost of painting = 20064 Rs

Step-by-step explanation:

As we know that Curved surface area of Cylinder is given by

$2\pi \: r \: h$

Area of lid

$= \pi \: {r}^{2}$

The area which has to be painted

$= 2\pi \: r \: h + \pi \: {r}^{2} \\ \\ = \pi \: r(2h + r)$

r= 28 cm

h= 100 cm

$= \frac{22}{7} \times 28(2 \times 100 + 28) \\ \\ = 22 \times 4(200 + 28) \\ \\ = 88(228) \\ \\ = 20064 \: {cm}^{2}$

Now the cost of painting is 1 rs per sq-cm

So, total cost to paint the area 20064 sq-cm is 20064 Rs

Hope it helps you.

Answer 2

hopes its help you and try to understand it