Jawabanmu

2014-05-22T19:17:23+07:00
2 x L alas = 2 x 24 cm2 = 48 cm2
2 x L ss smpng1 = 2 x ( 10cm x 4 cm )
                         = 80 cm2
2x L ss smpng2  = 2 x ( 10 cm x 6 cm )
                         = 120 cm2

48 cm2 + 80 cm2 + 120 cm2 = 248 cm2