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1ha = 100a -----> 1km² = 10 000a
1a = 0,0001km²
4,7a = 0,00047km²
1ha = 100a === 1km*2 = 10 000a
1a = 0,0001km*2
4,7a = 0,00047km*2
4,7 ara to 0,00047 km*2 .