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Three acres is 12,140.6m2
It depends on what kind of animal you are trying to fence in (or out). For an average cattle pasture, I prefer setting them 10 feet apart, so you would need about 150 T-posts. I still prefer setting three six-inch treated wooden posts for each corner; they will hold up better to the tensioning of the fence/barb wire.
5 vertical posts are needed. I---I---I---I---I
About 1/3 of an acre (0.339761249 acres).
3 acres are 130,680 square feet.