A circular pillar is 1m in diameter and 4.2 m in height .Find the cost of white washing the curved surface of a pilliar at the rate of 15 rupee per square m.
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Given that height of a pillar = 4.2m.
Given that diameter of a circular pillar d = 1m.
Then the radius of the pillar r = d/2
= 0.5m.
We know that curved surface area of the pillar = 2pirh
= 2 * 22/7 * 0.5 * 4.2
= 13.2m^2.
Given that cost of whitewashing per m^2 = 15 rupees.
Then the cost of whitewashing 13.2m^2 = 15 * 13.2
= 198.
Therefore the cost of whitewashing the curved surface area of pillar = 198 rupees.
Hope this helps!
Given that diameter of a circular pillar d = 1m.
Then the radius of the pillar r = d/2
= 0.5m.
We know that curved surface area of the pillar = 2pirh
= 2 * 22/7 * 0.5 * 4.2
= 13.2m^2.
Given that cost of whitewashing per m^2 = 15 rupees.
Then the cost of whitewashing 13.2m^2 = 15 * 13.2
= 198.
Therefore the cost of whitewashing the curved surface area of pillar = 198 rupees.
Hope this helps!
Answered by
2
given diameter of circular pillar = 1m
so, radius of pillar(r) = 1m/2 = 0.5m
Height of circular pillar (H) = 4.2m
Now, area of curve surface of circular pillar = 2πrh
= 2 × 22/7 × 0.5 × 4.2
= 22 × 0.6 = 13.2 m²
total cost = rate of washing × area of curve surface of circular pillar
= 13.2 × 15
= 198 Rs
so, radius of pillar(r) = 1m/2 = 0.5m
Height of circular pillar (H) = 4.2m
Now, area of curve surface of circular pillar = 2πrh
= 2 × 22/7 × 0.5 × 4.2
= 22 × 0.6 = 13.2 m²
total cost = rate of washing × area of curve surface of circular pillar
= 13.2 × 15
= 198 Rs
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