BC/AB = BF/BE
BC = BF/BE*AB
= 12/16*20=15
maka keliling = AB + BC + CD + AD
= 20+15+20+15= 70
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BC/AB = BF/BE
BC = BF/BE*AB
= 12/16*20=15
maka keliling = AB + BC + CD + AD
= 20+15+20+15= 70