If R is the radius of the circular curve and ϕ is the deflection angle, then tangent length of the curve is given by:
1
R tan ϕ/2
2
R tan ϕ
3
R tan ϕ/4
4
R tan ϕ/8
If R is the radius of the circular curve and ϕ is the deflection angle, then tangent length of the curve is given by: