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Vprisma = 3 x Vkubus
192 = 3 x Vkubus
Vkubus = 64
r = ∛64 = 4 cm
II. Cari rusuk prisma
Tinggi prisma = 3 x r = 3 x 4 = 12 cm
p = 4 cm
l = 4 cm
t = 12 cm
III. Cari diagonal ruang
d = √p² + l² + t²
d = √4² + 4² + 12²
d = √16 + 16 + 144
d = √176 = 4√11 cm