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AB . CE = BD . AC = FA . CB
AB . CE = 36 . 12 = 432
BD . AC = 432
18 . AC = 432
AC = 432 :18
AC = 24
FA . CB = 432
24 . CB = 432
CB = 18
keliling = AB + AC + CB
36 + 24 + 18
78 cm
A