CBSE Class 9 Answered
A pillar has a spherical top of radius 20 cm. Find the cost of polishing the top of 35 such pillars at the rate of Rs 30 per m2.
Asked by Topperlearning User | 18 Oct, 2017, 03:23: PM
Expert Answer
Given: Radius (r) = 20 cm
Let S be the surface area of the spherical top.
Surface area of 35 such balls= 35× = 176000 cm2
Cost of polishing 1 m2 or 10000 cm2 = Rs 30
Cost of polishing 176000 cm2=Rs (176000×) = Rs 528
Answered by | 18 Oct, 2017, 05:23: PM
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