Jawabanmu

2014-06-09T19:52:18+07:00
AD = DC = 8² + 6² = 64 + 36
                           = √100 = 10 cm

AB = BC = 15² + 8² = 225 + 64
                             = √289 = 17 cm

k = 10 + 10 + 17 + 17 = 54 cm