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Calculating an arch's width

 
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So a friend of mine and I are disputing over the abilty to calculate an arch's width (Specifically the St Louis Gateway Arch). Let me fill you in first. A friend of mine went down to St. Louis Gateway Arch. Seeing pictures of it they were thinking you would be able to calculate the width of it give that you had the hieght. I disagreed and stated you would need other parameters first before doing this. I'm just not remembering what parameters you would need. Your thoughts and input...???
 
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Ug, you are making me unearth long buried memories and most of them are rotted!

Here goes... If you know the height, to calculate the width you must know the parabolic formula that represents the shape of the arch. Assuming the arch is an real parabolic shape and not someone's idea of of a parabolic arch.

So my answer is uh... yeah... maybe.
 
Dale DeMott
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That's what I was thinking as well. I knew you had to have more information than JUST the height. The formula that represents the arch must also be present.
 
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