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2014-05-03T11:56:59+07:00
AD : AC = 3 : 4
AD = 3
AC = 4
CD = 4-3 = 1
AD = 3.5/1 = 15 cm
AC = 4.5/1 = 20 cm
AB² = AD . AC
       = 15.20
       = 300
AB  = √300
      = √100.3
      = 10√3   (C)
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