Question

If the radius of a circular curve is 100m and deflection angle is 90 then length of backward tangent

Answer 1

10is the answer of this question

Answer 2

length of backward tangent is 100 m

Concept:

Simple circular curve:

1. Tangent length $(T_1B) = Rtan\frac{\theta}{2}$

2. Apex distance (BE) = $Rsec(\frac{\theta}{2}-1)$

3. Cord length$(T_1DT_2) = 2R sin\frac {\theta}{2}$

4. Mid-ordinate (ED)=$R(1-cos\frac{\theta}{2})$

Calculation:

Given, R = 100 m and θ = 90°

∴ Tangent length = 100 × tan 45° = 100 m

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