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Find the total surface area of a cone , if its slant height is 9 m and the radius of its base is 12m .

Answers (1)

D Deependra Verma

Solution: We know that the total surface area $S$ of a right circular cylinder of radius $r$ and slant height $l$ is given by

$S= pi r^2+ pi rl =pi r (r+l)$

Here , $r=12m$ and $l=9m$

$herefore$ $S= left frac227 imes12 imes(12+9) ight m^2=792m^2$

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