Question

The total surface area of a cone is 704 aq. cm & radius of its base is 7 cm. Find the slant height of the cone. $(\pi =\frac{22}{7})$

Answer 1

Total surface area of cone$=\pi r^2+\pi rl$ (r$=$Radius, l$=$slant height)

$\Rightarrow 704=\pi r(l+r)$

$\Rightarrow 704=\frac{22}{7}\times 7(7+x)$

$\Rightarrow \frac{704}{22}-7=l$

$\Rightarrow l=25$cm.