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AB+BE=AE
AE=8 cm
AB=AE-BE
AB=8-BE
AB:BE=AD:EF=2:3
8-BE:BE=2:3
kali silang
2 BE=3(8-BE)
2BE=24-3BE
24=5BE
BE=24:5=4,8 cm
AB=2/3.4,8=2.1,6=3,2 cm=a