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The terms pole, perch, rod and rood have been used as units of area, and perch is also used as a unit of volume. As a unit of area, a square perch (the perch being standardized to equal 16 + 1 ⁄ 2 feet, or 5 + 1 ⁄ 2 yards) is equal to a square rod, 30 + 1 ⁄ 4 square yards (25.29 square metres) or 1 ⁄ 160 acre.
1 acre is approximately 208.71 feet × 208.71 feet (a square) 4,840 square yards; 43,560 square feet; 160 perches. A perch is equal to a square rod (1 square rod is 0.00625 acre) 4 roods; A furlong by a chain (furlong 220 yards, chain 22 yards) 40 rods by 4 rods, 160 rods 2 (historically fencing was often sold in 40 rod lengths [49]) 1 ⁄ 640 ...
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).
pound per square foot: psf ≡ 1 lbf/ft 2: ≈ 47.880 26 Pa [33] pound per square inch: psi ≡ 1 lbf/in 2: ≈ 6.894 757 × 10 3 Pa [33] poundal per square foot: pdl/sq ft ≡ 1 pdl/sq ft ≈ 1.488 164 Pa [33] short ton per square foot: ≡ 1 short ton × g 0 / 1 sq ft ≈ 9.576 0518 × 10 4 Pa: torr: torr ≡ 101 325 ⁄ 760 Pa ≈ 133.3224 ...
equivalent to one square hectometre 1.0 ha (2.5 acres) Imperial & US customary: square mile: sqmi Q232291: sq mi 1.0 sq mi (2.6 km 2) sqmi km2; acre: acre Q81292 (none) 1.0 acre (0.40 ha) square yard: sqyd Q1550511: sq yd 1.0 sq yd (0.84 m 2) square foot: sqft (ft2, sqfoot, foot2) Q857027: sq ft long code "sqfoot (foot2)" outputs square foot ...
Since an acre measured 10 square chains in Gunter's system, the entire process of land area measurement could be computed using measurements in chains, and then converted to acres by dividing the results by 10. [2] Hence 10 chains by 10 chains (100 square chains) equals 10 acres, 5 chains by 5 chains (25 square chains) equals 2.5 acres.
It is ordained that 3 grains of barley dry and round do make an inch, 12 inches make 1 foot, 3 feet make 1 yard, 5 yards and a half make a perch, and 40 perches in length and 4 in breadth make an acre. [2] [3]: 277 A similar statement is made in Liber Horn (as published in The Statutes of the Realm):
A square 5 perches on each side, or one quarter of an acre. acre, or arpent carré: 48 400 ~5107 m 2 ~6108 sq yd, or ~1.262 acres The French acre is a square 10 perches (one arpent) on each side. (Does not exactly correspond to the English acre, which is defined as 43 560 square feet.) North America: perche du roi carrée: 324 ~34.19 m 2 ~40.89 ...