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Mencari EF duluDC / EF = CF / FB = 18 / a = 3 / 4 (kali silang)
3a = 18 x 4
a. = 72 / 3 = 24 cm
jadi, EF = 24 cm
setelah itu, baru cari AB
EF /AB = CF / FB = 24 / b = 3 / 4
= 3b = 24 x 4
= b =96 / 3 = 32 cm
jadi, panjang AB adalah 32 cm