Jawabanmu

2014-08-14T11:15:18+07:00
2. Luas permukaan = 6r^2
 384= 6r^2
64=r^2
8cm =rusuk (a)

Rumus diagonal sisi = a \sqrt{2}
diagonal sisi = 8 \sqrt{2} cm

Rumus diagonal ruang = a \sqrt{3}
diagonal ruang = 8 \sqrt{3} cm

volume = r^3
volume = 8^3
volume = 512 cm^3

3. volume = 1728 cm^3
    rusuk = 12 cm

diagonal sisi = 12 \sqrt{2} cm
diagonal ruang = 12 \sqrt{3} cm

luas permukaan = 6r^2
luas = 6. 12^2
luas = 864 cm^2