Equivalencias
1 acre = 4.047 m^2
1 milla = 1609 m
1 milla^2 = 2.588.881 m^2
1 pie = 0,3048 m
1 pie^2 = 0,0929 m^2
a)
1 milla^2 x (2,588.881) m^2/milla^2 x 1 acrex/(4.047)m^2
= (2.588.881)/(4.047)
= 639,7037
1 milla^2 = 639,7037 acres
b)
(4.047) m^2 x 1 pie^2/(0,0929) m^2
= (4.047)/(0,0929)
= 43,562.9709
1 acre = 43,562.9709 pie^2