Question

6Q The curved surface area of cone whose radius is 12cm and slant height is 21 cm is

792cm2

750 cm2

800cm2

829cm2

​

Answer 1

Answer:

1st option 792 cm²

Hope it's helps!

Answer 2

Solution :-

radius (r) = 12cm

slant height ( l ) = 21cm

C.S.A of cone = πrl

Now, Putting given values in the formula

So,

C.S.A = πrl

$\sf{=> \dfrac{22}{7} × 12 × 21}$

$\sf{=> 22 × 12 × 3}$

$\sf{=> 66 × 12}$

$\sf{=> 792cm^2}$

Hence , Curved surface area of cone is 792cm²