**How much fence is needed to fence in an acre?**
http://mathcentral.uregina.ca/QQ/database/QQ.09.06/george1.html

An acre is a unit of area, it is 43560 square feet, but it can be any shape, a square, a circle, a long thin rectangle, a triangle, pie shaped or any other shape. If it is a square, the sides would be approximately 209 fet long and you would need 4 209 = 836 feet of fencing.

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