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panjang dikali 4
lebar dikali 4
tinggi dikali 4
maka 16*4 + 9*4 + t*4 =128
64 + 36 + 4t = 128
4t = 128 - 100
4t = 28
t =7
Jadi tinggi balok adalah 7 cm
panjang rusuk = 128 cm
p = 16 cm
lebar = 9 cm
maka :
jumlh rusuk = 4 x (p+l+t)
128 = 4 x (16+9+t)
128 = 4 x (25+t)
128 = 100+4t
4t = 128 - 100
t = 28/4
t = 7 cm
jadi tinggi = 7 cm