Question

in a building there are 25 cylindrical pillars.the radius of each pillar is 50 cm and height is 5cm .find the cost of painted curved surface area of pillars at the rate of rs70 per sq m​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

We have,

r= radius of cylindrical pillar =28 cm=

100

28

m

h= height of cylindrical pillar =4 m

∴ curved surface area of a cylindrical pillar = 2πrh=2×

7

22

×

100

28

×4cm

2

∴ Curved surface area of 25 pillar = 2×

7

22

×

100

28

×4×25m

2

=176m

2

Hence, total cost of painting at the rate of Rs 8 per m

2

=Rs(176×8)=Rs 1408