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)

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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