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= 2000 cm x 3200 cm
= 20 m x 32 m = 640 m²
maka panjang sesungguhnya = 8 x 400 cm = 3200 cm = 32 m
lebar sesungguhnya = 5 x 400 cm = 2000 cm = 20 m
maka luas sesungguhnya adalah = p x l
= 32 m x 20 m
= 640 m²
atau 6.400.000 cm²