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Math question?

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old

01-11-2006 22:44:12




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I have a lot of steel around the place and I'm thinking about another builting for hay and or tractors. So here it is. If I start with a 40 foot piece of 1 inch round and shpe if in to a half circle and put the ends 20 foot apart how tall will itbe in the center?? O'm thinking some where around 10 foot plus or minus a little, I'm I close or did I goof some??
Thanks




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gary cvase

01-12-2006 09:25:28




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 Re: Math question? in reply to old, 01-11-2006 22:44:12  
old, when i lay out a raidus for a wall in a building or a sidewalk. i use a rubber hose (water hose on the job site) it won't kink and it will give exactly what the height will be. that way you can see what your about to create. gary



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Coloken

01-12-2006 08:00:50




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 Re: Math question? in reply to old, 01-11-2006 22:44:12  
Old, I've got a degree in math, but this is one time I would do it the easy way, like Paul. Get a piece of string 40 inches long and lay it out on the table. Or draw it on paper to scale. A piece of thin metal that will bend?



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Bob N.Y.

01-12-2006 07:33:28




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 Re: Math question? in reply to old, 01-11-2006 22:44:12  
It will be higher than 10'. You said you would put the ends 20' apart. A circle with a 20' diameter would have a circumference of 62.8'. Half of that circle would be an arc with a length of 31.4' with a height at the apex of 10'. Since you are using 40' of tubing, the height of the arc would be higher and not a true cicle.



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Chances R

01-12-2006 06:57:39




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 Re: Math question? in reply to old, 01-11-2006 22:44:12  
I agree with Nebraska Cowman.



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Nebraska Cowman

01-12-2006 02:48:00




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 Re: Math question? in reply to old, 01-11-2006 22:44:12  
yup, a true half circle made with 40 ft material the peak would be 12.74 ft. the width would be twice that. So if you pulled the sides in to 20 ft the peak would be slightly higher, maybe about 15 ft



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Wally - Mich

01-12-2006 01:04:28




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 Re: Math question? in reply to old, 01-11-2006 22:44:12  
Calculating the Circumference of a Circle
The circumference of a circle is the distance around the outside of the circle. It could be called the perimeter of the circle. How to find the circumference of a circle:

The circumference of a circle can be found by multiplying pi ¶ (which is equal to 3.14) by the diameter of the circle. If a circle has a diameter of 4, its circumference is 3.14*4=12.56 If you know the radius, the diameter is twice as large

so take 3.14 x 20 = 62.8 62.8 divided by 2 = 31.4 so you only need 31.4 feet of rod to get 10 feet tall .

hope i figgured that right good luck

Wally

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paul

01-11-2006 22:54:39




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 Re: Math question? in reply to old, 01-11-2006 22:44:12  
While waiting for the math people:

Take a wire 4 inches long.

Bend it into a 1/2 circle 2 inches apart.

Measure your peak from that? Think it will be more than 1 inch tho?

--->Paul



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