Respostas

2013-10-04T22:06:40-03:00
21/14 = x/9
14x = 189
  x = 189/14
  x = 13,5

 21/14 = y/7
14y = 147
    y = 147/14
    y = 10 , 5

P = 21 + 13, 5 + 10,5 = 45 cm
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