Jawabanmu

2014-06-05T13:17:01+07:00
Panjang seluruh rusuk = (42 cm . 4) + (20 cm . 4) + (8cm . 4) = 168 + 80 + 32 = 280 cm.
2014-06-05T13:17:48+07:00
42x20x8
total rusuk 12
4 rusuk pnjang = 4.42=168
4 rusuk lebar = 4.20= 80
4 rusuk tinggi = 4.8= 32
total =280 cm