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Find the curved surface area of a cone, ...

Find the curved surface area of a cone, if its slant height is 60cm and the radius of its base is 21cm.

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given ,slant height `l= 60cm`
and the radius of its base`r=21cm`
so curved surface area of cone `= pirl`
`=pixx21x60`
`=3960cm^2`
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