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V = 1/3 × La × t
384 = 1/3 × La × 8
384×3/8= La
144 = La
rusuk = akar 144 = 12 cm
b.
tinggi sisi tegak = triple phytagoras
6,8,10
L semua = L alas + 4 L sisi tegak
L = 144 + 1/2 × 12 × 10
L= 144 + 60
L = 204 cm ^2
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