One acre comprises 4,840 square yards, 43,560 square feet
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^[1] or about 4,046.86 square meters

sqR=208.710’

208.71’=20.87x10

208’=26.08x8’

In 1958, the United States and countries of the Commonwealth of Nations defined the length of the international yard to be 0.9144 metres.^[2] Consequently, the international acre is exactly 4,046.8564224 square metres. Since the difference between the U.S. and International acre is only approximately 0.016 square metres, it is usually not important which one is being discussed.

United States survey acre

The United States survey acre is approximately 4,046.872 609 874 252 square metres; its exact value (4046 ^13,525,426⁄_15,499,969 m²) is based on an inch defined by 1 metre = 39.37 inches exactly, as established by the Mendenhall Order.

8x10 = 26x20 =  2087 robo spaces

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