# how many acres is this?

Discussion in 'Homesteading Questions' started by centexguy, Jun 27, 2006.

1. ### centexguyWell-Known Member

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My neighbor has a parcel of land that ajoins mine that I want to buy. I measured it today, and it was approx. 520'x400x800x130x800. five sides.I guess it must be 7-8ac.
Anyone give me a little help in figuring this out? :shrug:

2. ### farmergirlWell-Known MemberSupporter

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It has five sides, not 4? Guess I'm just used to living "in the box" Seriously though, you can search online for the square footage of an acre and figure it out from there.

3. ### moopupsIn Remembrance

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Draw it out in scale, make a triangle secondary line across the sharpest point's outside cornors, use the triangle formula to figure that portion seperately; and then the trapizodial (sp) formula on what remains, combine the results and divide by the square foot per acre.

Lets see who is not too lazy to do this....

4. ### MELOCMaster Of My Domain

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a square acre measures 208.71 ft. on each side.

@43560 sq. ft.

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6. ### tinknalWell-Known MemberSupporter

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First you need to figure out square footage, as moopups said, then you need to divide it by the square footage in an acre, as Meloc said.

7. ### Hurricane KurtWell-Known Member

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Using 520x800x520x800 in a simple acreage calculator it says 9.55 acres.

Kurt

8. ### JAKWell-Known Member

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The above method is best. There are various surveying formulas but the exact area can vary for those same lengths depending on the angles. I believe the maximum area would be achieved if all the corners fit on the same circle, but I haven't seen a proof of this theorem. It might also be that the sides need to run tangent to an inner circle instead, or also. Not sure. I am not sure if the order in which you place the sides matters, as long as you follow whichever rule it is. Another theory to test and prove. Anyhow, these are all moot points as the land probably does not have this shape anyhow.

As a very rough guess you could add up the length of all sides, multiple that number by itself, and divide by 16. This would be close if the land is roughly squarish. If it is more roundish with many sides, you could devide by 13. If it is roughly a rectangle twice as long as wide, you would divide by 18. If it was very triangular in shape, you might divide by 21, or worse.

My guess given the numbers would be to use 18.

520+400+800+130+800= 2650 ft
2650 x 2650 /18 = 390,139 ft2
7,022,500 ft2 / 43,560 ft2/acres = 8.96 acres

9 acres is a good guess, +- 1 acre

9. ### Hurricane KurtWell-Known Member

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Forgot to mention... I just added the 130 to 400 and made it 520 instead of 530 so its equal to the opposite side. Should be a close estimate anyway.

Kurt

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ROFLMBO.

11. ### JAKWell-Known Member

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That would still depend on most of the angles being more or less square, which they probably are. Good job. My guess of 9 acres +- 1 acre still holds, but it would have to have some pretty crazy jags to get down to 8 acres given those dimensions, which it might. 9 to 9.5 acres would be most likely.

p.s.
Perhaps the best guess is 9 acres + how much you like it - how badly he wants to sell it. Then you might have to factor in the wives.

12. ### Fire-ManWell-Known MemberSupporter

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You are app 420,000sqft, divided by 43,560 gives you app 9.6 acre------This is my Guess, but should be close!! Randy

13. ### poppyGuest

I'd forget it and try to buy something easier to figure on the other side.

14. ### palaniWell-Known Member

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Say 9.0 acres m/l

15. ### centexguyWell-Known Member

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Thanks for the help. 9ac sounds about right. its sort of a skinny pentagon shape.

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LOL, well the formula to figure out the area of this polygon is:

but wait... that's for the 3d model...

ummm, ok, just go with around 9 acres...

17. ### moonwolfWell-Known Member

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I think it's just under 7..25 acres by judging that the 800 ft. lenght is taken twice, so eliminate one of those 800 ft. numbers.
That leaves 520 x 400 or 208,000 sq. ft.
add to that the 130 x 800 or 104,000 sq. ft.
divide that by 43,560 sq. ft./acre
and I get 7.16 acres.
I think your first guess is closer than 9 acres.
mostly this is my hunch though. :shrug:

18. ### jnap31garden guy

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I hate algebra I knew I should have never looked at this thread.

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