The formula for length of the tangent of a simple curve having angle of deflection θ and radius of curvature R, is equal to:

1
R sin \({{θ} \over 2}\)
2
R cos \({{θ} \over 2}\)
3
R tan \({{θ} \over 2}\)
4
R cot \({{θ} \over 2}\)

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