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you need to know the rectangle dimensions to determine this. Acres is area and is width x length. If it is long and thin you will need many poles as it could be very long.

If it is a square since an acre is about 40,000 sq ft each side is 400 feet so perimeter is 1600 feet and you would need 1600/8 = 200 poles.

If it is a rectangle 1600 x 100 feet perimeter is 3400 feet and you would need 3400/8 = 450 poles.

If it is a rectangle 6400 x 25 feet perimeter is 12850 feet and you would need 12850/8 = 1607 poles, but the last two poles would only be 2 ft apart

etc.

Ask again and define the length or width of rectangle.

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The perimeter of a rectangular area is any length greater than the minimum which is when the rectangle is a square.

An area of 4 acres = 4 × 43560 ft² = 174240 ft²

If this is a square, the side length is √174240 ft and it has a perimeter of 4 × √174240 ft = 528√10 ft ≈ 1670 ft.

→ you would need approx 1670 ft ÷ 8 ft/pole ≈ 208.7 poles

→ You will need at least 209 poles depending upon the exact dimensions of the rectangular 4 acres.

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Q: How many poles at 8 feet apart do i need for a 4 acre rectangle field?
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