Question

the radius of the base of a cylinder pillar in a building is 25cm and it's height is 3.5m there are 10 such pillars in the building. what is the cost of painting the pillar if the rate is ₹1.55sq.cm
pls tell​

Answer 1

Answer:

₹8,52,500

Step-by-step explanation:

to find cost we will first find the total surface area of cylinder

height = 3.5 m = 350 cm

radius = 25 cm

therefore the total surface area of cylinder = 2 pie r (h+r)

= 2 x 22/7 x 25 x 350

= 2 x 22 x 25 x 50

= 55,000 sq.cm

there are 10 pillars so 10x55000 =5,50,000sq.cm

the cost of each sq.cm = ₹ 1.55

= 5,50,000 x 1.55

= ₹ 8,52,500

Answer 2

Answer:

Given, r=63 cm, h=15 m, h=15×100 cm

Curved surface area =2πrh

=2×

7

22

×63×15×100

=594000cm

2

Total number of pillars =4

CSA of one pillar =594000

CSA of 4 pillars =594000×4=2376000 = 237.6m

2