Tolong bantu jawab dong.. Besok di kumpulin.. :D

v tabung
[tex]\pi {r}^{2} t \: \\ = \frac{22}{7} \times 10.5 \times 10.5 \times 30 \\ = 22 \times 1.5 \times 10.5 \times 30 \\ = 33 \times 315 \\ = 10395[/tex]
v kerucut
[tex] \frac{1}{3} \pi {r}^{2} t \\ = \frac{1}{3} \times \frac{22}{7} \times 10.5 \times 10.5 \times 30 \\ = 22 \times 1.5 \times 10.5 \times 10 \\ = 33 \times 105 \\ = 3465[/tex]
v tabung - v kerucut
10395 - 3465
6930

V = Vtab - Vbola
V = (phi x r x r x t) - (1/3 x phi x r x r x t)
V = phi x r x r x t ( 1 - 1/3)
V = 22/7 x 21/2 x 21/2 x 30 ( 2/3 )
V = 11 x 3 x 21 x 10
V = 6930 cm^3

Jadi jawabnya B