bantu jawab donk ulangan nih

AE = 6
DE = 12
AC = 16
BE = ...???

DE/AC = BE/AB
12/16 = BE/(BE + 6)
12 × (BE + 6) = BE × 16
12BE + 72 = 16BE
72 = 16BE - 12BE
72 = 4BE
BE = 72/4
BE = 18