Question

if the diameter of base of a cone is 12cm and it's height is 8cm .find it's csa

Answer 1

First find out it's slant height using Pythagoras theorem.
here l=10cm,
now,csa=πrl
=3.14*6*10
=188.57 sq. cm.

Answer 2

r= 6cm
H=8cm
L=√6square+8square
=√100=10cm
CSA=πrl
=22/7×6×10
=1320/7
=188.57cm square