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.
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.
1 var means how many sq ft?
1 square VAR = 7.7 Square feet
1
1 acre = 40.5 ares
1.196 var, approx.
1 acre = 4,046.8564 square meters
1 acre = 2.529285264 rai
1 acre = 43,560 square feet.
1 acre = 43,560 square feet
1 acre = 4,046.86 m2
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Answer: 1 acre = 0.004046 km²