Legal Metric Units
1 square kilometer(km)= 100 hectares(hm)= 247.1 acres(acre)= .386 square miles(mile)
1 square meter(m)= 10.764 square feet(ft) 1 hectare(are)= 100 square meters(m)
1 hectare(hm)=15 mu=1hm2=10000 square meters(m)= 2.471 acres(acre)=.1 square kilometers (where h represents hundred meters, hm2 means square of hundred meters)
1 square mile(mile)= 2.590 square kilometers(km)
1 acre(acre)= .4047 hectares(ha)= 4.047×10 square kilometers(km)= 4047 square meters(m)
1 square foot(ft)= .093 square meters(m) 1 square inch(in)= 6.452 square centimeters(cm)
1 square yard(yd)= .8361 square meters(m)
1 mu=2000/3 square meters≈666.666 square meters
Market System of Measurement Units
1 square li=22500 square zhang
1 square zhang=100 square chi
1 square chi=100 square cun
1 square cun=100 square fen
1 square fen=100 square li
1 square li=100 square hao
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