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The rod is useful as a unit of length because integer multiples of it can form one acre of square measure (area). The 'perfect acre' [2] is a rectangular area of 43,560 square feet, bounded by sides 660 feet (a furlong) long and 66 feet (a chain) wide (220 yards by 22 yards) or, equivalently, 40 rods by 4 rods. An acre is therefore 160 square ...
Rood is an English unit of area equal to one quarter of an acre [2] or 10,890 square feet, exactly 1,011.7141056 m 2. A rectangle that is one furlong (i.e., 10 chains , or 40 rods) in length and one rod in width is one rood in area, as is any space comprising 40 perches (a perch being one square rod).
On May 18, 1796, Congress passed "an Act for the sale of land of the United States in the territory northwest of the River Ohio, and above the mouth of the Kentucky River". This law defined a survey grid system of 6–mile–square townships divided into 1–mile–square sections, with the defining unit being the chain, specifically Gunter's ...
Acre: 4,047 m 2: An area of land one chain (four rods) wide by one furlong in length. As the traditional furlong could vary in length from country to country, so did the acre. In England an acre was 4,840 square yards (4,050 m 2), in Scotland 6,150 square yards (5,140 m 2) and in Ireland 7,840 square yards (6,560 m 2). It is a Saxon unit ...
The only thing that changed was the number of feet and yards in a rod or a furlong, and the number of square feet and square yards in an acre. The definition of the rod went from 15 old feet to 16 + 1 ⁄ 2 new feet, or from 5 old yards to 5 + 1 ⁄ 2 new yards.
square mil; square thou: sq mil ≡ 1 mil × 1 mil = 6.4516 × 10 −10 m 2: square mile: sq mi ≡ 1 mi × 1 mi ≡ 2.589 988 110 336 × 10 6 m 2: square mile (US Survey) sq mi ≡ 1 mi (US) × 1 mi (US) ≈ 2.589 998 47 × 10 6 m 2: square rod/pole/perch: sq rd ≡ 1 rd × 1 rd = 25.292 852 64 m 2: square yard (International) sq yd ≡ 1 yd ...
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square mile mille carré: 640 acres 2.589988110336 km 2: acre: acre: 4,840 sq yd 4,046.856422 m 2: square rod perche carrée: 30 + 1 ⁄ 4 sq yd 25.29285264 m 2: square yard yard carré or verge carrée: a superficial area equal to that of a square each side of which measures one yard 8361.2736 cm 2: square foot pied carré: 1 ⁄ 9 sq yd 929. ...