Question

The volume of cone is 314.2cm cube and its height is 12cm . Find the CSA of cone.​

Answer 1

vol. of cone=1/3πr 2h=314.2

h = 12

I/3πr 2x12 =314.2

r2=3x314.2 / 3.14x12 = 25

r =v 25 = 5cm

CSA= πrl

I=vr2+h2

= v5^2+12^2 =v 25 +12=v169

l = 13

CSA= πrl=3.14x5x13=204. I cm2