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luas sisi
= luas alas + 4.luas∆
384 = (12 . 12) + 4 L∆
384 = 144 + 4 .L∆
384 - 144 = 4. L∆
240 = 4 .L∆
L∆ = 60
tinggi tegak
luas ∆ = 1/2 . a . t
60 = 1/2 . 12 . t
60 = 6 t
t = 10
tinggi Limas
=√10^2 - 6^2
=√64
= 8
volume
= 1/3 . luas alas . tinggi Limas
= 1/3 . 10 . 10 . 8
= 266,6