The formula for a rectangle is Length multiplied by width. The area is 21,780ft squared. If both sides are equal, then the square root of the area is a length of 147.58 feet. This is just if it's a square. If it's a rectangle both sides will vary a bit from that, and to get either, you have to measure the other length also.
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21,780 sqft
one (half acre) = 21 780 square foot
0.5 acres is 21780 square feet.
147.58 feet (rounded)
It's 65340 squared feet