This question cannot be answered for two reasons. First, there is no such thing as a "standard rectangle". Second, a foot is a measure of length in 1-dimensional space while an acre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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Assuming the area is a rectangle, 242.42 acres.
A rectangle measuring (300ft x 200ft) encloses an area of 1.3774 acres (rounded).
Multiply length and width to get square feet. This assumes you are talking about a rectangle. Then look up the conversion factor from acres to square feet, and divide by that conversion factor.
20.89 acres.
How many acres are 310 feet * 630 feet