this is a geometry problem. The only information given to me is that the fence needs to be 4 feet from the outside of the circle. I need to determine the exact feet needed to surround the circle.
2006-07-27 06:39:32 · 9 answers · asked by needtoknow 1 in Science & Mathematics ➔ Mathematics
okay....just to reinstate the only information given to me was the fence had to be 4ft from the edge of the circle. I also acknowledge that 4ft is part of the radius of the outer circle but but there is no other information regarding the inner circle. the inner circle could be any size.......and yes it has to be a circular fence.
2006-07-27 06:59:48 · update #1
You need *two* feet, your left foot and your right foot to walk around and build the fence. :)
Without knowing the diameter of the circle, there is NO WAY, to know how many feet of fence are needed to build around it. The best you can do is figure out how many *additional* feet are needed.
Let's suppose the question was, "You have a fenced in circle. Someone wants you to rebuild the fence another 4 feet from the outside edge. How many *additional* feet of fencing are necessary?"
This *is* solvable. Here it doesn't matter if the original fence was the size of a point, or the size of the earth. The original fencing will cancel out and it will be the same as if you built a fence (8 ft. diameter) around a point. The circumference of an 8ft circle is 8π ≈ 25.1327412 additional feet.
P.S. Let us now what the actual answer is, when you find out... I'm curious to know.
2006-07-27 07:11:16 · answer #1 · answered by Puzzling 7 · 1⤊ 1⤋
without knowing the size of the circle on the inside, we cannot give you a precise answer to the problem.
A fence that is 4 feet from the edge of the inner circle is (by definition) a circular fence.
Your fence needs to be 25.1327408 feet longer than the circumference of the inner circle. Figure out the circumference of your inner circle (diameter * pi), and add 25.1327408 feet.
There you go :D
2006-07-27 13:49:02 · answer #2 · answered by © 2007. Sammy Z. 6 · 0⤊ 0⤋
The fence could use as little as 32 feet of fencing. I assume a square fence. This would be for a circle infinitessimally small. For a bigger circle, you'd need more fence.
32 feet of fencing would not do for a circle 5 miles in diameter.
There are two critical missing parts of your geometry problem. How big is the circle? What shape is the fence?
2006-07-27 13:47:03 · answer #3 · answered by Vince M 7 · 0⤊ 0⤋
Don't you need to know the perimeter of the original circle?
With out that all you have is (D+8)*pi=C
D= Diatmeter of the original circle.
8= 4 feet added to the Diameter on both sides.
C= Circumfrence.
2006-07-27 13:43:43 · answer #4 · answered by cirestan 6 · 0⤊ 0⤋
4 times (8ft+diameter of of circle in feet) if the fence is square.
If circle. Pi times (diameter of old circle in feet plus 4).
2006-07-27 15:11:35 · answer #5 · answered by Anonymous · 0⤊ 0⤋
the question is how big is the circle? u said 4 ft from the circle but not the size of the circle itself.
measure how far it is from the center, double it, and multiply that by about 3.14
2006-07-27 13:43:14 · answer #6 · answered by Anonymous · 0⤊ 0⤋
I am not a math whiz but I would think you will need to know how large the circle is
2006-07-27 13:44:31 · answer #7 · answered by LSGregg 3 · 0⤊ 0⤋
jeez, did they give you info on the size of the circle, cuz you need that to solve.
2006-07-27 13:44:04 · answer #8 · answered by ConradD 2 · 0⤊ 0⤋
Darn it.. Should of paid more attention in math class.
2006-07-27 13:42:58 · answer #9 · answered by anaw81 3 · 0⤊ 0⤋