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3 : 2
p = 3÷2×12 = 18 dm
keliling = 2(p+l) = 2(18+12) = 2(30) = 60 dm
lebar=12 dm
panjang=3×6=18 dm
keliling=2×(panjang+lebar)
=2×(18+12)
=2×30
=60 dm