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BD kuadrat = ab kuadrat - ad kuadrat
13 kuadrat - 12 kuadrat = 169 - 144 = 25 = diakar jadi 5
DC kuadrat = ac kuadrat - ad kuadrat =
15 kuadrat - 12 kuadrat = 225 - 144 = 81 = diakar jadi 9
BC = BD + DC
5 + 9 = 14 cm (e)
maaf kalau salah (: