Question

In a cylindrical dome, there are 16 pillars. The radius of each pillar is 35 cm and height is 7 m. Find the total cost of painting the curved surface area of all pillars at the rate of ₹ 8 per sq m.\

Answer 1

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

Hope it helps ❤️

Answer 2

Answer:

The total cost of painting the curved surface area of all pillars at the rate of 8 per sq m. is 19.712.

Step-by-step explanation:

C.S.A. of cylindrical = 2πrh

→ C.S.A. of are pillar=2×22/7x35x7

=1540 cm^{2}

→ C.S.A. of 16 pillars =16×1540=24640 cm²

=24640x 10^-4 m²

=2.464 m²

→ Total cost =Rs. 8x2.464=Rs.19.712.