Jawabanmu

2014-06-02T18:24:53+07:00
La = 18×14
   = 252 cm²
Ka = 2(18+14) = 64
Lp = 2 × La + Ka×t
   = 2 × 252 + 64 × 15
  = 504 + 960 = 1464 cm²

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