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One acre equals 1 ⁄ 640 (0.0015625) square mile, 4,840 square yards, 43,560 square feet, [2] or about 4,047 square metres (0.4047 hectares) (see below).While all modern variants of the acre contain 4,840 square yards, there are alternative definitions of a yard, so the exact size of an acre depends upon the particular yard on which it is based.
The rod, perch, or pole (sometimes also lug) is a surveyor's tool [1] and unit of length of various historical definitions. In British imperial and US customary units, it is defined as 16 + 1 ⁄ 2 feet, equal to exactly 1 ⁄ 320 of a mile, or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain), and is exactly 5.0292 meters.
Gunter's chain (also known as Gunter's measurement) is a distance-measuring device used for surveying. It was designed and introduced in 1620 by English clergyman and mathematician Edmund Gunter (1581–1626). It enabled plots of land to be accurately surveyed and plotted, for legal and commercial purposes.
A killa or acre is measured rectangularly, reckoned as an area 36 karams (198 ft) x 40 karams (220 ft) (43,560 square ft). 1 /5th of a killa or acre is known as bigha 1 Karam = 5.5 feet = 1.83; or Gaj; 1 Yard or Gaj = 36 Inch = 0.91 Metre = 3 feet; 1 Sq Yard = 9 Sq Feet; To convert Sq feet to Sq Yard = Divide by 9
The acre is also commonly used to measure land areas, where 1 acre = 4,840 square yards = 43,560 square feet. An acre is approximately 40% of a hectare. On the atomic scale, area is measured in units of barns, such that: [13] 1 barn = 10 −28 square meters. The barn is commonly used in describing the cross-sectional area of interaction in ...
Square miles should not be confused with miles square, a square region with each side having a length of the value given. For example, a region which is 20 miles square (20 miles × 20 miles) has an area of 400 sq mi; a rectangle of measuring 10 miles × 40 miles also has an area of 400 sq mi, but is not 20 miles square.
Measurement of tree circumference, the tape calibrated to show diameter, at breast height. The tape assumes a circular shape. The perimeter of a circle of radius R is .Given the perimeter of a non-circular object P, one can calculate its perimeter-equivalent radius by setting
The Irish acre or plantation acre measured one Irish chain by one Irish furlong, or 4 Irish perches by 40, or 7840 square yards: approximately 0.66 hectares or 1.62 statute acres. [54] The Lancashire acre around the Solway Firth and the Churchland acre in Yorkshire were the same size, which Frederic Seebohm in 1914 connected to the erw of Gwent ...