If R is the radius of the circular curve and ϕ is the deflection angle, then tangent length of the curve is given by:

This question was previously asked in

KPSC JE 2016: Specific Paper

Option 1 :

R tan ϕ/2

CT 1: Current Affairs (Government Policies and Schemes)

54560

10 Questions
10 Marks
10 Mins

__Concept:__

For simple circular curve:

1. Tangent length (T1B) = R tan θ/2

2. Apex distance (BE) = R (sec θ/2 - 1)

3. Cord length (T1DT2) = 2R sin θ/2

4. Mid-ordinate (ED) = R (1 - cos θ/2)

**Explanation:**

Given,

R = Radius of simple circular curve

θ = Deflection angle = ϕ

Hence the tangent length of the curve is given by,

Tangent length (T1B) = R tan θ/2

**Tangent length (T1B) = R tan ϕ/2**