Question

the height of a cone is 16 cm and its base radius is 12 cm find the curved surface area and total surface area of cone use Pi is equal 3. 14

Answer 1

h=16cm
r=12
CSA=pi×r×l
l^2=h^2+r^2
=16^2+12^2
=256+144
l^2=400
l=20
CSA=3.14×12×20
=753.6
TSA=Pi×r(r+l)
=3.14×12 (12+20)
=3.14×12×32
=1205.76

Answer 2

Hey, Harish here

Here is your answer.
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Given that,

$r =12cm$

$h=16cm$

We know that,

$l = \sqrt{r^{2}+h^{2}}$

⇒$l = \sqrt{12^{2}+16^{2}}$

⇒$l = \sqrt{400}$

⇒$l = 20cm$

Now, we know that ,

$T.S.A= \pi rl+ \pi r^{2}$

         $= \pi r(r+l)$        
  
         [tex]= 3.14\times12(12+20) [/tex]

         $=1205.76 cm^{2}$

∴ Total surface area of cone is 1205.76 cm².
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Hope my answer is helpful to u.