Example:
1.The diameter of the base of a cone is 32cm.Its height is 12cm.Calculate its slant height.
l^2=h^2+r^2
l^2=(12)^2 +(16)^2
l^2=144+256
l=\[\sqrt{400}\]
l=20cm
Example2.The lenght of the cone is 20cm.Its radius is 16cm.Calculate its height.
h^2=l^2-r^2
h^2=(20)^2 -(16)^2
h^2=400-256
h=\[\sqrt{144}\]
h=12cm
Example3.The length of the cone is 20cm.Its height is 12cm.Calculate its radius.
r^2=l^2 -h^2
r^2=(20)^2 -(12)^2
r^2=400-144
r=\[\sqrt{256}\]
r=16cm
