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sxs + 4 L sisi tegak = 384
12x12 + 4x12xt/2
144 + 24t = 384
24t = 384 - 144
24t = 240
t = 10
Volume = 1/3 La x t
= 1/3 x 12 x 12 x 8
= 384 cm^3
jadi Lp = Volume.
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