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= 5 cm : 1/400
= 5 cm x 400/1
= 2000 cm
= 20 m
l sebenarnya = JP : S
= 4 cm : 1/400
= 4 cm x 400/1
= 1600 cm
= 16 m
L = p x l
= 20 m x 16 m
= 320 m²