Radius of a circle with 20' circumference = 20'/2pi = 3.18'
Area of a circle with 3.18' radius = ((3.18')^2)pi = 31.8 square feet
An acre is 66 feet by 660 feet so 1,452 feet of fence would surround an acre.
The amount of fence needed to surround 2 acres depends on the perimeter, not the area.
If the area is square-shaped, you would need 2,425 feet of fencing.
depends on the shape. A circle would have the greatest area-to circumference ratio, a square somewhat worse and something like a star really bad.
That depends on the shape of the lot. But, if the lot was a perfect square, you would need 2,891.98 feet of fence to surround it.
You would need 2,640 feet of fence.
The maximum area possible using 100 feet of fencing is that inside a circular fence. But, since you asked about a rectangular fence: a 25x25 fence would hold 625 square feet. a 10x40 fence would hold 400 square feet. a 5x45 fence would hold 225 square feet. As you can see, the square is the rectangle that encompasses the largest area, as it is closest to a circle.
That depends on the shape of the lot. But, assuming the lot is a perfect square, you would need 10,560 feet (two miles) of fence to surround it.
The maximum area that you can enclose with 3000 feet of fencing would be a circle of radius 477.46 feet. This circle would have an area of 716197.2 square feet which is 16.442 acres. The minimum area that you can enclose is infinitesimally small - go for a very, very long and very, very narrow area.
There are 3.14159 (or π or pi) diameters in any circle. The "136 feet of fence in a circle" describes the circumference of the circle. The relationship of the circumference to the diameter (feet across) is pi, or 3.1415. So there are 136/3.1415 = a little under 43.3 feet in the diameter.
That would depend on the length and width of the acreage.
A circle with a radius of 14 feet has an area of 615.75 square feet.