Ineed on 8 and 9 i don’t know how to do them lol

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 =

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b. 2 and 4

step-by-step explanation: