How many feet for a 2.5 acres?

2.5 acres is 108,900 square feet. The square root of 108,900 is 330, so one way to have 2.5 acres would be a square that is 330 feet on each side. Of course, acreage can be of any shape. No matter the shape, if the area within is 108,900 square feet, then it's 2.5 acres.