The total cost of painting the curved surface of a solid cone at the rate of Rs.5 per sq. m is Rs.19800. If the radius of the base of cone is 21m, find its total surface area.
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The total cost of painting the curved surface of a solid cone at the rate of Rs.5 per sq. m is Rs.19800. If the radius of the base of cone is 21m, find its total surface area.
please answer fast
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