１坪＝
3.306ｍ2=0.033r=
0.00082acre

１ｍ2＝
0.3025坪=0.01r=
0.000247acre

１ｒ＝
30.25坪=100ｍ2=
0.02471acre

１acre＝
1224坪=4047ｍ2=
40.47r

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