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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 .

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

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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

Posted by

Deependra Verma

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