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5000000cm=50000000mm
np. 32,4mm²=2mm*16,2mm
2*50000000mm=10000000mm=1000000cm=10000m=10km
16,2*5000000mm=81000000mm=8100000cm=81000m=81km
P=10km*81km
P=810km²
Odp: Powierzchnia rzeczywista jeziora wynosi 810km².