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= 84 cm
=12+12+16
=40cm
K.balok (bagian bawah) = 2*(p+l)
=2*(20+4)
=48cm
K.balok(bagian samping) =2*(p=l)
=2*(14+4)
=36cm
jadi jumlah keliling bangun datar adalah 40+48+36 = 124cm