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sudut BAC = sudut DAE
sudut BCA = sudut AED
b) AB/AD = AC/AE = BC/DE
C) BC/DE = AC/(AC+CE)
6/9 = AC/(AC+3)
2/3 = AC/(AC+3)
3 AC = 2AC + 6
AC = 6
shg, panjang AE = AC + CE = 6 + 3 = 9 cm