Jawabanmu

2014-04-16T17:51:10+07:00
Luas permukaan 
2 x 30 x 40 = 240
2 x 30 x 45 = 270
2 x 40 x 45 = 360 +
                    870
870 x 2 = 1940 harusnya segitu
2014-04-16T17:52:51+07:00
4 p + 4 l + 4 t = kerangja 4 30 +4 40 +4 45= 120 + 160+ 180 = 460 × 2 = 920