tolong bantu jawabkan no 7 dan 8 dan 9

Matematika

Jawaban :
7. V = 4.168,67 cm3 (A)
8. Lp = 384 cm2 (B)
9. Lp = 912 cm3 (B)

Pembahasan :
7.
[tex] v = \frac{4}{3} \times \pi \times {r}^{3} \\ = \frac{4}{3} \times 3.14 \times 1000 \\ = \frac{4}{3} \times 3140 \\ = 4186.67 \: {cm}^{3} [/tex]
8.
[tex]luas \: permukaan \: = 6 \times {s}^{2} \\ = 6 \times {8}^{2} \\ = 6 \times64 \\ = 384 \: {cm}^{2} [/tex]
9.
Lp = 2(pl + pt + lt)
= 2 ( 216 + 144 + 96)
= 2 × 456
= 912 cm2

Wallahu A'lam Bishowwab...
Maaf kalo salah..