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The acre dates back to very old surveyor's units called chains, rods, and links. An acre is 10 square chains or 100 square rods, for example. Those units were the sizes of actual tools used when surveying. 640 is simply the conversion factor to take those amounts to square miles.
Today rods and chains are used about as often as cubits and hogsheads, but somehow the acre has survived - at least in the U.S., which AFAIK is the only country still using it to measure land. Everyone else uses hectares (1/100 of a square kilometer, or about 2.5 acres).
Wiki User
∙ 16y ago
There are 640 acres in a square mile because historically, the measurement of land in the United States was based on the English system, where one acre is defined as a rectangular area measuring 66 feet by 660 feet. When you multiply the number of acres in one row by the number of rows in a mile, you get 640 acres in a square mile.
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How many acres in a square mile?
One square mile equates to 640 acres.
How many acres are in a half mile by a half mile?
There are 640 acres in one square mile. Therefore, 0.5 square miles is equal to 0.5 x 640 = 320 acres. WRONG! See below correction. 0.5mi x 0.5mi = 0.25mi^2 = 640 x 0.25 = 160 acres
How many acres are in a square mile?
640 acres, algebraic steps below: 1 mi²*640 acres 1 mi²=640 acres
640 acres in a square miles?
Answer: 640 acres = 1 square mile.
How many miles are in ten acres?
Miles are length and acres are area, so the two cannot be compared. On the other hand, a square mile is 640 acres, so an acre is 1/640 of a square mile, and 10 acres = 10/640 sq. mile = 1/64 sq. mile.
How many acres are in square mile?
1 acre = 0.0015625 square mile 1 square mile = 640 acres
How many sq acres in 1sq mile?
There are 640 acres in 1 square mile.
How many acres are in a half mile by a half mile?
There are 640 acres in one square mile. Therefore, 0.5 square miles is equal to 0.5 x 640 = 320 acres. WRONG! See below correction. 0.5mi x 0.5mi = 0.25mi^2 = 640 x 0.25 = 160 acres
What is 640 acres?
There are 640 acres in 1 square mile.
What is a square mile in acres?
One square mile is 640 acres.
640 acres in a square miles?
Answer: 640 acres = 1 square mile.
How many acres in 1 sq. mile?
One square mile = 640 acres.
How do you convert a square mile into acres?
There are 640 acres in one square mile. So, just multiply the number of square miles by 640 to get acres.
How many acres are in a square a mile?
One square mile is 640 acres.
How many acres I a square mile?
One square mile is 640 acres.
How many acres you are square-mile?
1 square mile = 640 acres
How many acres are i a square mile?
One square mile is 640 acres.
