a=5cm
b=2cm
P=a×b
a=5×20000
a=100000cm
a=1000m
b=2×20000
b=40000cm
b=400m
P=1000×400
P=400000m2
P=400000÷1000
P=400km2
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a=5cm
b=2cm
P=a×b
a=5×20000
a=100000cm
a=1000m
b=2×20000
b=40000cm
b=400m
P=1000×400
P=400000m2
P=400000÷1000
P=400km2