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Verified answer
AF/AC = DF/BCAF/10,8 = 2,25/4,5
AF × 4,5 = 2,25 × 10,8
4,5AF = 24,3
AF = 24,3/4,5
AF = 5,4 m
DE = CF = AC - AF
DE = CF = 10,8 - 5,4
DE = CF = 5,4 m
Jadi panjang DE adalah 5,4 m