Perhaps you are referring to the vara, which was a surveying unit of length, originating from Spain. It is approximately 1 yard. Many surveys in Texas were specified in vara, which was 33 1/3 inches. Note that the var or vara is a unit of length, while acre is a unit of area. So square vars could convert to acres. See related link, below.
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One acre is equal to 160 var. The var is a unit of area commonly used in some regions, particularly in South Asia, and it is equivalent to approximately 272.25 square feet. Therefore, when converting acres to vars, 1 acre equals 160 of these smaller units.
1 var means how many sq ft?
1 acre = 40.5 ares
1 acre = 4,046.8564 square meters
1 acre = 43,560 square feet.