one (half acre) = 21 780 square foot
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0.5 acres is 21780 square feet.
147.58 feet (rounded)
1 acre = 43,560 square feet 1/2 acre = 21,780 square feet
I assume you want a rectange of dimensions 68 times (unknown). Here is how you solve it. 1) Look up the definition of "acre"; specifically, how many square feet does an acre have (unless you have already memorized it, of course). 2) Convert the half-acre to square feet. 3) Divide the number of square feet by 68 feet to get the unknown other length.
0.10 acre = 4,356 square feet.