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a
volume balok= p . l .t
2835= 7x . 5x . 3x
2835= 105x'3
27=x'3
3= x
panjang= 7x = 7.3 = 21 cm
lebar= 5x = 5.3 = 15 cm
tinggi= 3x = 3.3 = 9 cm
b. Luas permukaan balok
2(p.l+p.t+l.t)
2(21.15+21.9+15.9)
2(315+189+135)
2 . 639
1278 cm'2