8) h = 30
r = 16
l= 34
Surface Area= 2514.28
Volume= 8045.71
9) r = 12
h = 2
l = 5/2
Surface Area= 908.08
Volume= 298.42
Step-by-step explanation:
8)
h = 30
r = 16
l=?
Since its is right angled triangle, using pythogras theorem we can find the length of cone
l^2 = h^2 + r^2
l^2 = (30)^2 + (16)^2
l^2 = 900 + 256
l^2 = 1156
Taking square root on both sides
√l^2 = √1156
l = 34
Surface Area = 
" alt="\pi r(r+\sqrt{h^2+r^2} )" />" />
π = 22/7, r = 16, h=30
Surface Area = 
Volume = 
π = 22/7, r = 16, h= 30
Volume = 
9)
r = ?
h = 2
l = 5/2
Since its is right angled triangle, using pythogras theorem we can find the radius of cone
l^2 = h^2 + r^2
(5/2)^2 = (30)^2 + (r)^2
25/4 = 900 + r^2
r^2 = 900 * 4/25
Taking square root on both sides
√r^2 = √144
r = 12
Surface Area = " alt="\pi r(r+\sqrt{h^2+r^2} )" />" />
π = 3.14, r = 12, h=2
Surface Area = 
Volume =
π = 22/7, r = 12, h= 2
Volume = 
