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b = 300 m
P = a * b
P = 200 m * 300 m = 60 000 m²
1 a = 100 m² 60 000 m² = 600 a
1 ha = 10 000 m² 60 000 m² = 6 ha
1a = 100m²
1ha = 100a
Liczę na naj :)