Pls bantuin no 9 , 10 ,11

9. V = πr²t

V = 22/7 x 21 x 21 x 45

V = 22 x 3 x 21 x 45

V = 62.370cm³

10. V = alas x tinggi segitiga / 2 x tinggi prisma

V = 60 x 20 / 2 x 45

V = 60 x 10 x 45

V = 27.000cm³

11. V = ⅓ × π × r × r × t.

V = 1/3 x 3,14 x 10 x 10 x 30

V = 314 x (1/3 x 30)

V = 314 x 10

V = 3140 cm³