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l = 4a
t = 8a
Luas = 2 (p.l + p.t + l.t)
= 2 (12a.4a + 12a.8a + 4a.8a)
= 2(48a^2 + 96a^2 + 32a^2)
= 2(176a^2)
= 352a^2
Volume = p.l.t
= 12a.4a.8a
= 384a^3