• 1 acre = 43 560 square foot
  • 2-23-2017 The world's first tape measure was "Gunter's Chain" and it was used by all surveyors for a bazillion years or so. The chain was 66 feet long, and ten chains made a furlong, exactly 1/8 mile. A square of one chain per side had 4,356 square feet, and ten square chains made an acre, 43,560 square feet.

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