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P=12
l=12
L=12.12=144 cm2
L persegi panjang=144 cm2
P=18 M=1800cm
L=144÷1800=0,08 cm
jadi panjang persegi panjang harus 0,08 cm
karna
1800×0,08=18×8
=144 cm2
#semoga benar