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p = 12 cm
l = 5 cm
Volume = 840 cm³
Dijawab :
Volume = p x l x t
840 = 12 x 5 x t
840 = 60 x t
t = 840/60
t = 14 cm
Jadi, tinggi balok tersebut adalah 14 cm.
Maka,
L.Permukaan = 2(pl +pt +lt)
= 2{(12 . 5) +(12 . 14) +(5 . 14)}
= 2{60 +168 +70}
= 2{298}
= 596 cm²
Itu jawabannya.