Question

find the curved surface area of a cone whose vertical height is 8cm and radius of the base is 15cm

Answer 1

$\Longrightarrow{\boxed{\bold{Answer:800.7 cm^2}}}$

$\textbf{\underline{Step-by-step explanation :- }}$

Curved surface area of cone = πrl

Here we have, r = 15 cm and h = 8 cm. But we lack l. We know that,

l = √( r² + h² )

l = √( 15² + 8² )

l = √( 225 + 64 )

l = √( 289 )

l = 17 cm

Now, curved surface area = 3.14 × 15 cm × 17 cm

$\bold{\huge{=\underline{800.7\:cm^2}}}$

Answer 2

first find the l i.e slant height . then use the formula of CSA and find out