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4 [m²]=4:1 000 000 [km²]=4 : 10^6 [km²]=4*10^(-6) [km²]
km²=km*km=1000[m]*1000[m]=1 000 000 [m²]
3[m²]=3*100[dm²]=3*10²[dm²]
3[dm²]=3 : 100 000 000[km²]=3:10^(-8)[km²]=3*10^(-8)[km²]
22[m²]=22:10 000[ha]=22:10^4[ha]=22*10^(-4)[ha]
ha=100[a]=100*100[m²]=10 000[m²]
5[cm²]=5*100[mm²]=5*10²[mm²]