Question

Example 6: In a building there are 24 cylindrical pillars. The radius of each pillar
is 28 cm and height is 4 m. Find the total cost of painting the curved surface area of
al pillars at the rate of 8 per m².​

Answer 1

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Answer 2

Answer:

Total cost of painting the curved surface area of  all pillars is 675.56 Rs

Step-by-step explanation:

Curved Surface area of the cylinder

$A=2\pi rh$

here r= 28 cm = 0.28 m

h= 4 m

$A= \pi \times 0.28 \times 4\\A=3.5185 m^2$

Curved surface area of the  24 pillers is

= 24 x 3.5185 = 84.44 m²

Cost of painting the curved surface area of   pillars is 8 per m²

Cost of painting the curved surface area of    24 pillars is

=8 x 84.44 = 675.56 Rs

Total cost of painting the curved surface area of  all pillars is 675.56 Rs