Question

In a building there are 25 cylindrical pillars each of diameter 88 cm and height 7m. Find the cost of painting its curved surface area at the rate of Rs3.50 per m2

Answer 1

Step-by-step explanation:

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