15 cylindrical pillars of a building have to be cleaned.If the diameter of each pillar is 42 cm and the height of each pillar is 5m ,what will be the cost of cleaning these pillars at the rate of Rs. 10 per square metre?
Answers
Answered by
31
It is given that the diameter of the cylindrical pillar is 42 cm so, we have to convert it into metre so, it will become 0.42 m, now we find the radius.
So, 0.42÷2= 0.21 m.
And we know that height = 5m.
Now, by putting the formula of the cylinder :- 2×22÷7×0.21×5 m square.
=> 6.6 m square
Then for 15 pillars:- 15×6.6= 99 m square
So, the cost of the pillar will be,,,,
10×99= Rs 990 -ans.
So, 0.42÷2= 0.21 m.
And we know that height = 5m.
Now, by putting the formula of the cylinder :- 2×22÷7×0.21×5 m square.
=> 6.6 m square
Then for 15 pillars:- 15×6.6= 99 m square
So, the cost of the pillar will be,,,,
10×99= Rs 990 -ans.
Answered by
2
Answer:
It is given that the diameter of the cylindrical pillar is 42 cm so, we have to convert it into metre so, it will become 0.42 m, now we find the radius. So, 0.42-2= 0.21 m. And we know that height = 5m. Now, by putting the formula of the cylinder :- 2x22÷7x0.21×5 m square. => 6.6 m square Then for 15 pillars:- 15x6.6= 99 m square So, the cost of the pillar will be,, 10x99= Rs 990 -ans.
Similar questions