Jawabanmu

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2014-05-11T19:38:13+07:00
L.p=(2 x l.a) + (kll.alas x t)
   =(2x 1/2 x 15 x 8) + ((17 + 15 + 8) x 10)
    =120+45
     =165
2 4 2
2014-05-11T19:40:04+07:00
Alas + tutup = 15 x 8 / 2  = 60 x 2 = 120
Iuas sisi tegak = 10 (17+8+15) = 400
totaI 400 +120 = 520 cm2