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If 1 acre of land is avalible, and each tree is 25 feet apart, how many trees can you fit in the acre of land?

 Dec 2, 2015
edited by Guest  Dec 2, 2015
edited by Guest  Dec 2, 2015
edited by Guest  Dec 2, 2015

Best Answer 

 #2
avatar+128731 
+10

Actually.....this is an interesting problem......

 

We can do better than 64 trees if we consider another configuration.....

 

Since the acre can be in any shape......consider one that is in the shape of an equilateral triangle

 

To find the side,S, of such a triangle, we can solve this:

 

43560  = [sqrt(3)S^2/4]  

 

And S  = about 317.7 ft on each side

 

Since the trees have to be 25 feet apart, it we plant the first one at the apex, we can actually plant

 

300/25 + 1   = 12 + 1 =  13 down each side  .....there will be an "dead" space at the bottom of this triangle where no other trees can be planted with a 25 foot spacing requirement......

 

Then, theoretically, the number of trees that we could plant  = [13*14] / 2   = 91

 

And, unlike a square planting area, each tree is guaranteed to be 25 ft from any of its "nearest neighbors"........[the diagonal neighbors in a square planting are sqrt(2)*25 ft apart....this "wasted" space is why we can't plant as many as in the equilateral configuration ]

 

Look at the picture of the first five rows :

 

 

Note that each tree is exactly 25 ft from any of its neighbors......!!!!

 

It would be interesting to see if another arrangement [such as a hexagonal one] would even be more productive.....!!!

 

 

 

 

cool cool cool

 Dec 3, 2015
 #1
avatar
+5

If 1 acre of land is avalible, and each tree is 25 feet apart, how many trees can you fit in the acre of land?

 

1 square mile=640 acres

5280^2=640 acres,

1 acre=43,560 square feet

1acre=sqrt(43,560)

1acre=208.7^2 feet on each side

208.7/25=8.35 or 8 trees on one side, therefore,

8 X 8=64 trees, vertically and horizontally

 Dec 2, 2015
 #2
avatar+128731 
+10
Best Answer

Actually.....this is an interesting problem......

 

We can do better than 64 trees if we consider another configuration.....

 

Since the acre can be in any shape......consider one that is in the shape of an equilateral triangle

 

To find the side,S, of such a triangle, we can solve this:

 

43560  = [sqrt(3)S^2/4]  

 

And S  = about 317.7 ft on each side

 

Since the trees have to be 25 feet apart, it we plant the first one at the apex, we can actually plant

 

300/25 + 1   = 12 + 1 =  13 down each side  .....there will be an "dead" space at the bottom of this triangle where no other trees can be planted with a 25 foot spacing requirement......

 

Then, theoretically, the number of trees that we could plant  = [13*14] / 2   = 91

 

And, unlike a square planting area, each tree is guaranteed to be 25 ft from any of its "nearest neighbors"........[the diagonal neighbors in a square planting are sqrt(2)*25 ft apart....this "wasted" space is why we can't plant as many as in the equilateral configuration ]

 

Look at the picture of the first five rows :

 

 

Note that each tree is exactly 25 ft from any of its neighbors......!!!!

 

It would be interesting to see if another arrangement [such as a hexagonal one] would even be more productive.....!!!

 

 

 

 

cool cool cool

CPhill Dec 3, 2015
 #3
avatar+118613 
0

If 1 acre of land is avalible, and each tree is 25 feet apart, how many trees can you fit in the acre of land?

 

How big is an acre?   43560 sqare feet according  to our guest.

 

43560/25=1642.4

 

So if the land was 1 foot by 43560 feet  and there was a tree up against one end of it then 

I think 1643 trees would fit altogether. :/

 Dec 3, 2015

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