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in Surface Areas And Volumes by (46.2k points)
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A sphere is cut into two equal halves and both the halves are painted from all the sides. The radius of the sphere is r unit and the rate of painting is Rs. 8 per sq. unit. What is the total cost of painting the two halves of the sphere in rupees ?

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Total surface area of the two halves = 3πr2 + 3πr2 = 6πr2 sq units 

∴ Cost of painting the two halves = 6πr2 × Rs 8 = Rs 48 πr2.

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