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the circular arc of a railroad curve has a chord of length 3000 feet and a central angel 40 degree. find the radius of the arc
 Oct 7, 2013

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There is a formula but I don't use it and I can never remember what it is because it is not necessary.

I'd just say (40/360)*2pi*r = 3000

Then just solve the equation.
 Oct 7, 2013

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