in the building there are 30 cylindrical pillars the radius of the east pillar is 42 and height is 7 find the total cost of painting the curved surface area of all pillars @ rupees 10 per metre square
Answers
The total cost of painting the curved surface area of all pillars @ rupees 10 per metre square is Rs. 554400.
Step-by-step explanation:
The radius of each cylindrical pillar, r = 42 m
The height of each pillar, h = 7 m
∴ Curved Surface Area of each cylindrical pillar = 2πrh = 2 * 22/7 * 42 * 7 = 1848 m²
But, the no. of pillars in the building is given as = 30
∴ Curved Surface Area of 30 cylindrical pillars is,
= 30 * 1848 m²
= 55440 m²
Cost of painting the curved surface area of all the pillars is Rs. 10 per meter square
Thus,
The total cost of painting the curved surface area of all 30 pillars are,
= [55440 m²] * [Rs. 10/m²]
= Rs. 554400
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