the cost of polishing the top of a circular table of radius 2.1 metre at the rate of 10 rupees per square metre is how much

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Step-by-step explanation:Radius of circle= 2.1 metre

Area of circle= πr²

= 22/7×21/10×21/10

= 13.86m²

Cost of polishing= ₹10/m²

total cost= ₹10×13.86

= ₹138.6 Ans

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