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Find the total surface area of a cone, i...

Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m.

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given
`r=12cm`
`l=21m`
so total surface area of cone `=pir(r+l)`
`=(22/7)xx12(12+21)`
`=1101.7cm^2`
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