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20 cm × 80 = 1.600 cm
2000 cm × 1600 cm= 3.200.000 cm2
karna kuadrat dicoret 4 nolnya jadi 320 m2. jawabanya c.320
maaf klu salah...
= 25 x 20 x 80^2
= 3.200.000 cm^2
= 320 m^2