Jawabanmu

2014-05-24T08:07:39+07:00
2.(100+55+115)
2. 270=540cm
Rumus luas balok -> L = 2 (p x l + p x t + l x t). Jadi, = 2 (80 x 20 + 80 x 35 + 20 x 35) = 2 (1600 + 2800 + 7000) = 2 x 11.400 = 22.800 cm pangkat 2
Im sorry im forgot
2014-05-24T08:09:42+07:00
Kalau ngak salah yaa
8×20×35=56000