Square measure or measure of surface
[ British Units]*
144 sq.inches = 1 sq.foot
9 sq.feet = 1 sq. yard
301/4 sq.yards = 1 sq.rod,pole or perch = 272 1/2 sq.ft.
40 sq.rods = 1 rood = 1210 sq. yds.
484 sq.yards = 1 sq. chain
4 roods = 4840 sq .yards = 160.sq. rods = 10 sq.chains
= 1 acre = 43,560 sq.ft.
640 acres = 1 sq.mile
*An acre is the area of a square whose side is 208.71 ft.long. *
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