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Q1: If Δ is the angle of deflection of a simple curve of radius R, the length of its long chord, is

A R cos

B 2R cos

C R sin

D 2R sin .

ANS:D - 2R sin .

Length of the chord - diameter multiply by the half degree of the sine.
= D x sin angle/2
= 2R x sine θ/2 RcosΔ/2 = length between the midpoint of long chord and center of the curve.
 



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