The External Diameter Of A Conical-coronet Made Off Thermocol Is 21cm In Length. To Wrap Up The Outer Surface Of The Coronet With Foil, The Expenditure Will Be ₹ 57.75 At The Rate Of 10p Per M2. Let Us Write By Calculating, The Height And Slant Height Of The Coronet. - ConceptEra

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Question

The external diameter of a conical-coronet made off thermocol is 21cm in length. To wrap up the outer surface of the coronet with foil, the expenditure will be ₹ 57.75 at the rate of 10p per m2. Let us write by calculating, the height and slant height of the coronet.

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