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4(29 + a) = 180
116 + 4a = 180
4a = 64
a = 16 cm = lebar balok
volume balok = p . l . t
= 20 . 16 . 9 = 2880 cm³
80 + 36 + 4a = 180
116 + 4a = 180
116- 116 + 4a = 180-118
4a = 64
a = 64/4
a = 16
maka
Volume = p x l x t
volume = 20 x 9 x 16
volume = 180 x 16
volume = 2880 cm³