20 cylindrical pillars of a building are to be painted. If the diameter of each pillar is 40 cm and the height is 3 m then, what will be the cost of painting them at the rate of RUPEES 14per square metre?
Answers
Answer:
Step-by-step explanation:
The cost of painting the pillars is Rs.9.68.
Step-by-step explanation:
Given : In a building 20 cylindrical pillars are to be painted the diameter and height of each pillar are 44 cm and 7 respectively.
To find : The cost of painting the pillars at the rate of rupees 5 per square meter ?
Solution :
The diameter of the pillar is d=44 cm
The radius of the pillar is r=22 cm
The height is h=7 cm.
The curved surface area of the cylindrical pillar is
The area of 1 cylindrical pillar is 968 cm².
The area of 20 cylindrical pillar is cm².
Converting into meter,
1 m²= 10000 cm²
1 cm²= 0.0001 m²
19360 cm²= 1.936 m²
The cost of painting the pillars at the rate of rupees 5 per square meter.
The cost of painting the pillars is
Therefore, the cost of painting the pillars is Rs.9.68.
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