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  #1  
Old 06-16-2006, 01:15 PM
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Default acres in a circle

My circle has a diameter of 900 ft. How many acres?
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  #2  
Old 06-16-2006, 02:11 PM
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Robert Fogt Robert Fogt is offline
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Default Re: acres in a circle

The formula for the area of a circle is:

Area = Pi * radius²

Pi * (900/2)² = 636172.5

So its about 636172.5 square feet, we then convert that to acres on the Area conversion page, or just divide by 43560.

636172.5 / 43560 = 14.6 acres
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Old 07-13-2009, 12:00 AM
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Default Re: acres in a circle

circle is 2881 feet long at longest point. how many acres is this?
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Old 07-13-2009, 07:22 AM
Dirtman Dirtman is offline
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Default Re: acres in a circle

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Originally Posted by Unregistered View Post
circle is 2881 feet long at longest point. how many acres is this?
If it's actually a circle, use the formula given above by Robert. If 2881 is the diameter, simply divide by 2 for the radius.

From your post, I'm not sure you have an actual circle. If not, we need more information before we can give you an answer.
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  #5  
Old 07-07-2010, 07:29 AM
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Default Re: acres in a circle

Pi(R²)= area
3.14 * 900²= area
3.14 * 810,000= 2,543,400

ft²/acre= 43560

2,543,400/43560= 58.39
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  #6  
Old 07-07-2010, 08:50 AM
Dirtman Dirtman is offline
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Default Re: acres in a circle

Quote:
Originally Posted by Unregistered View Post
Pi(R²)= area
3.14 * 900²= area
3.14 * 810,000= 2,543,400

ft²/acre= 43560

2,543,400/43560= 58.39
You (probably inadvertantly) used diameter in your calculation instead of radius. When using diameter instead of radius, either divide Pi by 4 or divide diameter by 2 to get radius.

Robert's answer is correct.

Last edited by Dirtman; 07-07-2010 at 08:56 AM.
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  #7  
Old 03-12-2012, 10:52 AM
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Default Re: acres in a circle

my area is 3607 feet around how many acres in that area
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Old 03-23-2012, 07:31 PM
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Default Re: acres in a circle

the perimeter is 6583 ft. how many acres?
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Old 03-24-2012, 02:51 AM
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Default Re: acres in a circle

Quote:
Originally Posted by Unregistered View Post
the perimeter is 6583 ft. how many acres?
The radius is 6583 ft/(2*pi) = 1047.7 ft
Area = pi*r² = 3 448 560.5 ft²
1 acre = 43560 ft², so 79.2 acre
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Old 07-14-2012, 01:20 PM
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Default Re: acres in a circle

How many acres for a 1338 ft cir le
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