Respuesta :
Answer:
The total cost of painting the curved surface area of all pillars at the rate of Rs 10 per square meter is Rs.554400.
Step-by-step explanation:
Given : In a building there are 30 cylindrical pillars. The radius of each pillar is 42 m and height is 7 m.
To find : The total cost of painting the curved surface area of all pillars at the rate of Rs 10 per square meter ?
Solution :
Radius of each pillar r= 42 m
Height of each pillar h= 7 m
The curved surface area of each pillar is [tex]CSA=2\pi rh[/tex]
Substitute the value,
[tex]CSA=2\times \frac{22}{7}\times 42\times 7[/tex]
[tex]CSA=1848\ m^2[/tex]
Area of 30 pillars is given by,
[tex]A=1848\times 30=55440\ m^2[/tex]
The curved surface area of all pillars at the rate of Rs.10 per square meter.
The cost painting is [tex]C=55440\times 10=Rs.554400[/tex]
Therefore, the total cost of painting the curved surface area of all pillars at the rate of Rs 10 per square meter is Rs.554400.
