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384 = 1/3 x 12.12 x tinggi
384 x 3/1 = 144 x tinggi
tinggi = 1152/144
tinggi = 8 cm
tinggi sisi limas = √8² + 4²
= √64 + 16
=√80
= 4√5 cm
luas sisi limas = 1/2 x 12 x 4√5
= 24√5 cm
luas semua sisi limas = 24√5 x 4
= 96√5 cm