Highway Engineering - Engineering

Q1:

If R is the radius of a main circular curve, Δ is the angle of deflection and α is the polar deflection angle of any point, its radial distance is

A
3 R sin Δ/3 sin 2α

B
3 R sin Δ/2 sin 3α

C
3 R sin Δ/2 sin 3α

D
3 R sin 2Δ sin α

ANS:A -

3 R sin Δ/3 sin 2α

Give explanation of the answer.