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Lihat sudutnya! sisi2 yang berada didepan sudut yang sama itu sebanding
QR/8 = 16/9
QR = 16*8/9
QR = 128/9 cm
RT = QR-QT
RT = 128/9-9
RT = 128/9-81/9
RT = 5 2/9 cm
Jwabannya yang B